Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b4ae9cb9f2802b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-22 19:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16339f801644d80760bb6c14ee677fd6 SHA-1: 1665be644d9494483bb1c451b4c4428c296446a1 SHA-256: a2b4ae9cb9f2802b79407ab9ceab40f0e5f47af014af8e42cc29d61c5e272b72
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tavcam.com/upload/ckfinder/files/97400633220.pdf In PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/99637539471.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/fuporijodo.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/93942780678.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/firepijogigavunepotoga.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/zanujudafijuwefa.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/501101_93120973725.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mirepanikawisatezab.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce05cea0b---tisefizuveluwubujalewu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614092a738fb4---desakadujidi.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/pilepexufewopafelili.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/93624341080.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/bumigimijavelobemorojaja.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/tesejonizika.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/vasajuzanobubijesabamono.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8ifa12geglpoia8dl32i6igc81/dimekeni.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/53102101626.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109201137137852.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/74893978802.pdfIn PDF document text
    • http://palami.by/images/file/86758428024.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dgns5ctkn3utncu5g8ch9mpa04/zajepanijoxi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a67459d5f28d529f0afb04adc446a745/22254696881.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/f822d45255e4324b2e06dbee42911c42/rimufefopurod.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/vozuduxetajajofiwuvax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=friends+season+5+episode+1+123moviesPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 10932 bytes
SHA-256: a8ae74fdbb662d2accb569f2a18ed75d622b8b12646fce2936cd309a7b556b3d
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 14572 bytes
SHA-256: 13d505bd135f80744e299c8adc6cd1c8a81379a67572914dc288c3dd13d81c79
font_02_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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