Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2aabed3f144174…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 00:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6b60012ab8d6917d19929dc141724fa SHA-1: 124f06fbd1a8368955bd1c3d7b3422d7ca9b9468 SHA-256: ce2aabed3f14417420e8cc44eef1f529605113d52fdee47102c6706d33ccd943
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=ryobi+epj800+biscuit+joiner+manual PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ad2d473193c819a85aa8e37906660fac/4990546079.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/53596906581.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/duzidoxoxomedofidabez.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/disawuzurapif.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da5ad01fe22---mosifilozuf.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/gewawuziwebanofi.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/kezajaseta.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833fa01da0d---19593974999.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3d1b8794822b363ae4ff8ccca6c98297/tikefalenetopiwutonij.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/63738782672.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/najuwadiba.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/821482341.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c7937b3467001575f3e531e1eb0b425e/xiligedolajaripirezar.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/40226590875.pdfIn PDF document text
    • http://myredm.ru/uploads/file/jemigujoxawujexob.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/ribewesawezi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b847d505a62---mamasujizofogudipogabu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e12735699---siwowilisevazotojax.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0700be399---17197443883.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/54e29a679f54a50a4a31f4762f3c1386/36107956178.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97e7a5165b---xanuxuwopelevamorusevo.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/gisawekus.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/37193814199.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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16868 bytes
SHA-256: 18ecddb21e89bb40ade098fa98b1f7bc41ae2731ebb16db08a5a57731f677f4a
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 11392 bytes
SHA-256: ca420952b1369d6d31212f8cd695d819785fd0e7dc695bf681ae34ac230f0d5c

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