Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6c3ae58a12923c…

MALICIOUS

PDF

88.0 KB Created: 2021-08-04 12:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad4f5f238f038e2f31250dd143678289 SHA-1: 7c7a61e2ee1eef048b52c5328be36d3e3b9a3e40 SHA-256: 9f6c3ae58a12923c301e7b1dd6a83267b048f1f70fadbb31a1c5b80b6a3928e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on potentially disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • 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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1e47d289---kisinixuz.pdf In PDF document text
    • http://kokocurry.gm/userfiles/file/105604203.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/26146561914.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1dhintnqn6ij2ed2cupsaep7l5/borupodoror.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e03b2533b---waxifumuz.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qgq4m0lulsm3lgi74s8mj7o0ai/80042185955.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f51b89c98---zakaxebogiwezijajodera.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/penugotanekusutozula.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3a6faql2gugf7dm0r11h17eko6/45982411878.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lg5r5cuj33309q85c6m72h8p2a/51025175105.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/66141801531.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34206d7a---57577289781.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xepapijefamef.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/belimawukugeterune.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/sonewajof.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/iresc578cnj171641m0c3iefed/sawevizilodebogusasonal.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/67810175673.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/10670866269.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bakurakumonunodasinezod.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/43290246939.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d7060e99cd9---rowinidofasafonuwigejoz.pdfIn PDF document text
    • http://momsystem.ru/public/file/sulezomijavafazipujurofi.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/31812015494.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/49805631956.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6050c9a785---39131468857.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/makowusarufazovanaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+be+a+serial+killer+in+sims+4PDF link annotation
    • 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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10656 bytes
SHA-256: 8bb7a5f1cc8055970e1243c6c4fa06f27ecd522d8c41b13f802536bcaf473444
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16764 bytes
SHA-256: eda38bff9d3e5ca92e6ee19f83f81a7c8a43b5e7255fc616058dcc727f38b976
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1