Malicious PDF — malware analysis report

Static analysis result for SHA-256 db685216c40d0fd6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb6d21d4c9fcea5ddb21b8726dc6e51b SHA-1: 908c60341f90f2a3679824c2bcdbb4d66a4e7cd7 SHA-256: db685216c40d0fd63ae535938c7017d657113e1e8cab667072c1f2a6c9e784d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm hosted on disposable or compromised domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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) or Microsoft license-boilerplate 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://oniceh.ru/uplcv?utm_term=how+to+create+pdf+with+password PDF link annotation
    • https://brs.jo/userfiles/files/26980624114.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gutokowu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/nunakubazidu.pdfIn PDF document text
    • http://swiss-ex.com/ropolegi.pdfIn PDF document text
    • https://aspirans.com/files/file/vapekafiwovumijaw.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/fegifokeg.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kosuvir.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/debaverusejebulamamabaxej.pdfIn PDF document text
    • http://wenxuezj.com/images/File/97555265356.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3f0d1876ec5610cd27db32b77b5364e2/55231957393.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/o8kd6nqc1gk7lhl9sbku20h0a3/87123650793.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091575c63cbc.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bunabezavopoximolow.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1373aa6fd7---vovezaxenabinedinem.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087449231917---98755604795.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/59211515863.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a660e30ca5b---bojomewofineresaguruleke.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d03285c7e74---50090296850.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7fddf37c6e8db435ae922f8fb9433015/42333823705.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a31965c1---20522015806.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/fizomokid.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/s606c7lib746d0he6ivkm0l764/wupidosakenumefenozeno.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jg3di4h5grv444qjm3nqm0lj91/jopopepaves.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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 17376 bytes
SHA-256: b3125b4c2c570fff7098eb6d35aa703795657aa5706e5f6bfbdf800bda7d1bce
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 10644 bytes
SHA-256: 7c0030529beee5ae30aa6213d9d117143dccfa9a557e126d0487742a49965853
font_02_sfnt_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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