Malicious PDF — malware analysis report

Static analysis result for SHA-256 113ac895102bfac1…

MALICIOUS

PDF

83.8 KB Created: 2021-07-30 10:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76d6da50c667f75a0d7770d8f4947969 SHA-1: d6030c3b1495f3dd007c422a62ef01a3bb92528f SHA-256: 113ac895102bfac12b5e2506184e8dcb9f8b24940e2e39dfaba56745d540dfeb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of multiple embedded URLs and the link farm heuristic strongly suggest a malicious redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a344a57054d2abe771defcdc241a189d/62320693248.pdf In PDF document text
    • https://bamor.org/userfiles/file/46406553120.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/sisirimotupame.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/54412739182.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd58a67d1a---37754682897.pdfIn PDF document text
    • http://hasyo.net/files/file/migaviwolufe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nm0bietgihan34blgo677h2cen/8846494639.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jnkifkqkl3gg04b9rti6fiskug/gewubanuno.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607084f9de692---83637939094.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d4a82cd83cca860645c2253491112542/nikevazenisexoxov.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/jebiwefuliro.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/vepugubigogoviga.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0b22bc9a---jatadap.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/17f75ee7d6ea1c8a2c44d73ea2e7081b/guwijopa.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/puvapesugujedave.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/78576998625.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/12b6982b6550af2fec0f7db4a7bfb8bd/mebuviborazig.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc192fe448c---71096925142.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/muvefijizuxugen.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/subelusenowemudot.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/85606339466.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709c4e7020---79574604020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+change+battery+in+ademco+alarm+systemPDF link annotation
    • 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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 16684 bytes
SHA-256: 6f544419e188756948a4f643224a9829ca08ae9643772050dcd73337f5fb7003
font_01_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 11148 bytes
SHA-256: 22a2fb41e36ee25b383fd002518d2778fdde4d64c10375c9c43f319ac8a4d927

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