Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6f9ed3ac23f476…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 17:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12035b371d62b6ff15e5ebc0bf1fa8d1 SHA-1: dbc55bbe5607f2481885275ecfe36dae379dda4a SHA-256: 3d6f9ed3ac23f476de28f33f3cb3466c8a1bd850eda96a59ceb55b9d7fd99781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of numerous links on compromised domains points towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://kartywspomnien.pl/uploads/assets/file/vibeminusuvibunifir.pdf In PDF document text
    • http://kasystemofkarate.com/clients/861259/File/valojexajopi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/98624700262.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/93ce4d053a9883faea65c06a1f5ae18f/46460629244.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f5e825d4f3a688f681d64aaaec97f7aa/bigatudiziranetubovet.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/14216435985.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qecfttharifef73otv8j2qs865/xezezufuribenopebelofof.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7p1f1ej8fgd4kd5rtcrt244v65/tiberamivomaxemamevo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c63c5d082---88968609582.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/gexusukananavepijemi.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/mitopufeluwinefapevovir.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/molisenorusasipanarufam.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/70889099527.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5f08e24b823c94f080feb3b169623b5f/32102806086.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/63944124062.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/55c9fea24dfa0ee34eedccf00479c07f/zawesi.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/77007007953.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/fiwozodukiwiguwijavaja.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610930f9a8f3b---52839555466.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/37134984716.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6c73d4c6---10679628727.pdfIn PDF document text
    • http://vejwun.cz/images/53231658135.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/zikegajirefexede.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/43762620236.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/suwilijumasa.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/nejovabuzuxovagates.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+reader+for+windows+8+exePDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16616 bytes
SHA-256: 212e28233a8c4820e0da070ffc254edf445a614c88172d701a9e29ed7d0936e9
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 10600 bytes
SHA-256: 4bd1edc3bf71c2c8dca276c2baea0702d47372e964ba7b0a175e7b426238d862

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