Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ca16229c4fb68e…

MALICIOUS

PDF

90.9 KB Created: 2021-10-15 07:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 23c01468640114901d3eba51e0414fe0 SHA-1: 8ad7af64a5d9f678113458fc69b1c36cae93e65a SHA-256: f6ca16229c4fb68ed55b8f465dd0ac23679bf7ce5b70e767269748fc5b215c4b
176 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 potentially compromised content management systems. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, further supported by the presence of multiple external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=tamil+movies+utorrent+free+download PDF link annotation
    • https://univerosg.com/ckfinder/userfiles/files/31192979690.pdfIn PDF document text
    • http://archbot.pl/files/file/11630385498.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/eb7b3m9mc5f5g9ra1rgbetjab3/35719434361.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/86672120118.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68078636293.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/tisolatepopivi.pdfIn PDF document text
    • http://gabortech.com/admin/file/75035489805.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16168ca7e7e294---62191800031.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/busopi.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/murolamikumejoxavu.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/zukodilonevumatolilaki.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xebetepude.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/96969161343.pdfIn PDF document text
    • http://jsdarvin.com/files/34869447776.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/meworilelimuvep.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7kqh4t450uu7la7vh0rdlemuq4/kezijim.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/zoxujenowusubonebalitepe.pdfIn PDF document text
    • http://nhuahoanglong.com/luutru/files/96454988885.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/mobupukavidavoke.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/99142349001.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///bilukelopejizesajazul.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909040633.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910002108.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/nutazoginofufevose.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dopajajibetotozilanafabed.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_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 10732 bytes
SHA-256: 15ca6066e1fc6711e0717ffad590ec2dcd96f80bf0e713cd4e89a4e077126597
font_01_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 17432 bytes
SHA-256: c8c95ad2e7bbe4c5a85b00f6b544ed3bb9218194da98b977f43fecb508a4179d

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