Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69ee69d8fab9440…

MALICIOUS

PDF

86.5 KB Created: 2021-07-30 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff36918178d93994efaa33bd35774052 SHA-1: 045f1477c99d28c49dda67f02fb021b463afb5a4 SHA-256: f69ee69d8fab94400a4489c3515aa44a8cda616a95eb0acae5204d8951df8a73
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised WordPress uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as does the SE_CALLBACK_LURE heuristic suggesting a potential scam. No scripts were extracted, but the overall structure and URL findings are highly indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=ring+size+guide+letters+to+numbers PDF link annotation
    • https://hotel-la-licorne.fr/userfiles/file/81017299558.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/67522175142.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/27739333475.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/forokitumimivida.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/furuxeboniti.pdfIn PDF document text
    • http://dakmet.pl/upload/55026546708.pdfIn PDF document text
    • http://www.celso.org/download/37022543961.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06411d88b8---mavoti.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/311d0f1a1f30c424a1d20d2df455644b/tufoke.pdfIn PDF document text
    • https://premium-house.uz/images/file/49215667858.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/58e6921a957698b8c8f6276d6bfbc0c1/13199521167.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/fisirorojoturokadirinub.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1o1tsaon360kn7upfqc32s1l92/gurefidevorepagukogafuta.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/sudosanedixi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4dece4c59a92d53283635dbe5d175d4d/dorezajikopujodusisilupem.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2a6d3ceb2bebc35fa5c2ad54dcad2100/92682354019.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/watumil.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609277d456d86---95490661934.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d0ae7583476bcb8ab2e691d2c65f12c2/fipuwisepogodase.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xutam.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/nasovuwas.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9fed737e79a761eb0d3b3980be60f9f4/puvugob.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/32468840843.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5ed27pd1bhvsk2knf6kj0s3ceg/jukulufivemodebamukotepi.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 10772 bytes
SHA-256: d84d2772ce4ed34507e97ab3f9e4f8fc597f424eec47045cdb980e3084e3c4e9
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16948 bytes
SHA-256: 444475ecf0ccca43ae0b16526ed70d42456dd2418c5734fdff88fe05bdd37b10

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