Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a5ac60a14209b3…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 10:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a78af86d6b8009cd865f4f4440098c45 SHA-1: 06dd50b9bf59b98364e9d0acdd3d7f99e60f8416 SHA-256: 06a5ac60a14209b3b9820e2f082cee514ae47c5889ac646b7f3625f1f5e2a6be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic firings confirm the presence of external URI links and link farms on potentially compromised or disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=accurate+keyword+research+tool PDF link annotation
    • https://gamma-electronics-eg.com/userfiles/files/dazizobejotakikezaripu.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/16476542709.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/45029404828.pdfIn PDF document text
    • http://ge-mak.com/files/55123901153.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/11c7f76578453de87d1d816e8ff716ab/65155872756.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea53ad5625---baxisevafezenajod.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/gofir.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubisanojabuwa.pdfIn PDF document text
    • http://dmkert.hu/files/file/28317969029.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/40155962247.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/losas.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/3196422007.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/39064358854.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/safivuve.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gizunuxejikexizirogamal.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/tipejoderumegurulumilolef.pdfIn PDF document text
    • http://ud2-140.com/files/49026346553.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109082049229704.pdfIn PDF document text
    • http://denge.aero/upload/files/94702023236.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/88765542682.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/sidosizenimoturisemusixax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ebcfd12eb8d6f3b40b8ea22c3dfbea8a/83895766831.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31288070013.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_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 17780 bytes
SHA-256: c730c05b5c64d5bb7fa42ed3a9cbf8453d76828be4e48833ee8357d3d135b33c
font_02_sfnt_off00013d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D85 10644 bytes
SHA-256: 3c9bef9f18facc67d501e7baf2b5085cd7aa11b631b87d5b0cf3b80a56b93cc4