Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1fcfc9101f9584…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 12:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 952a600319fa82e50a0ac9d50978b7aa SHA-1: 13af3537d71b622c04148c9c27b6f554cfbd75b1 SHA-256: 0a1fcfc9101f9584e9c7fe2e811946f908f3c09c74fc1fea6852b4373f0f2b4f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://avistravel.ro/userfiles/file/likib.pdf
    • https://aquatrustfina.com/userfiles/file/32868630949.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f81dd3c366431f6ccedf91ea0ec4fc37/jezibotiketale.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f5551e43e51f4a8bcd834a5633ce10b8/dazufeloguse.pdf
    • http://cdmvt.cz/sites/default/files/55293012911.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082039031583---15329383051.pdf
    • https://summit-christian-academy.org/scauserfiles/files/potapefap.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/14349184408.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/82dhpfq8vieelbdttirodhnjr6/23842126315.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8eaa26ca71349b339b1f33ba49c53689/23258097522.pdf
    • http://imssp.by/data/images/fxeditor/file/pujubivabejupa.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/97130889063.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/95e434aae5546bd45ab4614332ec8bdf/29412390918.pdf
    • https://narimasu-chintai.net/jcfiles/file/30857059503.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705664505d4---tuwugarupu.pdf
    • http://briarcliff70.com/clients/874901/File/81408684903.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608205d2dd437---92648518975.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/memodiburaxejeviduwikikip.pdf
    • http://x04ydivan.ru/userfiles/file/fokitotixividu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/b05b10870c49d9c0a517a87ad372849e/pobixij.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160967016455d6---74275398906.pdf
    • http://svazekobciorlice.cz/userfiles/file/69782672673.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9375aa5ab8---wedotutiw.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/81f9acb5c633ef326274d04588d23d78/79307316755.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607708bf37f7b---wojukosekebaza.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d7953ec58294980f25de4f6255594b4c/60930069402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=flax+seeds+in+summer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bd.bin
a7e9856e18ebbc319bf096bd049d864934c0ae3de927eedad1fc5f18eb2df4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 17040 bytes
font_01_sfnt_off00012086.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
font_02_sfnt_off0001389d.bin
318f892904237eb21c666be3041bf6ad6d046661f79c5f51bf9ff6ef7f3caed4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 10372 bytes