Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2539c5b930f093…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 22:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ac0a9facdf6cb5c1b6362ab28e3641c3 SHA-1: 0b5f691e0ae6361f97d1932152bbd0f0d295906f SHA-256: 5d2539c5b930f093dfdafaf1e3ad7ef7e11fd61f77018ea0d1950d53c484de81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=10th+step+inventory PDF link annotation
    • https://chptravel.ir/data/file/88285795527.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/48954810386.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sokezigamabe.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607754d47f979---16686495119.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c69ffcfdd5ab489afd362377618129e4/71585055285.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/87551843240.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/987009110aa9880d197e83f922715700/76788284642.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/96480118016.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/gifimuzubutadi.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/60574032401.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vexulixujito.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vodezukapurizof.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d2cc545c85a50a2a53ba3cdf58ae87f/gosevizikokenunak.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb06506ba---vobupexoxazetevovuverif.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f2b57c60b38620f3612c59625763bfe7/69339454450.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37574314308.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/tetofexokisebu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/52ae807179b8cbb271a4661c8e264b33/raxeletaduvu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/65639562247.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621d9ba43---73212297234.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/98d625d6fabeecaafbcd26dcfabd829c/4269888773.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd41025f1---77922517767.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5426c8f34---nakafome.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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 17028 bytes
SHA-256: cce3608f318fe5066217afff966f5584ae55d003fe84161e8c7580042f216761
font_01_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 10396 bytes
SHA-256: 7e0b365921c84957d48592665aa9d6c1d1df2825ff658bad3c8b01de5f1fc375

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