Malicious PDF — malware analysis report

Static analysis result for SHA-256 a650523704b94b50…

MALICIOUS

PDF

87.2 KB Created: 2021-07-19 18:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8bef25b46a5a11b4bf4918bf37658dd9 SHA-1: 7fbf215c33c7bbb69f82844056617a9be9fbe341 SHA-256: a650523704b94b50499d3c7084ebdcfb7b09b034b6b55503fc9b1e7602e2c479
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports a malicious intent, likely to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://debeleven.net/UserFiles/File/nagalizawoxugawi.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c8899366cf4ec6018ed8e4b41986f474/kepetikuwebabogobef.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nivafotunij.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kaworepalagokawevavul.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/79209442507.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/gufegazewamunakajujebaki.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078733dabe45---26759482501.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fb5a62c80bba7f05bf3b6e3f949acaf/vodepi.pdfIn PDF document text
    • https://mollis.rs//files/14349702586.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d437cccfc768208315eed8808869a1eb/pebigunulog.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/27149113432.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/walowogoduzoj.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160acd5f317e67---31475687469.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/10637797160.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/bedekakafapoginerikanil.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/97645411974.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/516e194a80e47c2058041219c49fd4b8/vijinimumewinetodoxumug.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e8afdfa16e4323fa1d3b73aa156c5d9e/guzudizafeg.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/vuzimanatilepulezewanemeg.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9305bef36e---nopibuberexowaro.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670afb85d9---duborumadizijewok.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e963a56b388de560097a3ab6ed772877/55399080107.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cc5f0fe7a---wiwibal.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a68ad2453b---98121290379.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xelanuxilolu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6227c7361f---61101720503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=outer+banks+scallopsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc66c1015---20904622534.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16640 bytes
SHA-256: 69b682fd5b374e77fa0c661e6674b79dc5f820799c07658163ddb8fd981faf1f
font_01_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 10632 bytes
SHA-256: 54a5dc0f2fa59274a6c51dac0a46a0283d29fb161f1690d54c513746feb8e43b