Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c98f109531cf5ef…

MALICIOUS

PDF

81.5 KB Created: 2021-06-28 04:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26101128f07585abf59d3ff2cfc02f39 SHA-1: 755ba6c19aedca982d8263cbcbcb0a9de589a397 SHA-256: 8c98f109531cf5ef5201ee6abf976f382bf3567cdcc5bb03e476ba9f2c285192
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=shout+to+the+lord+piano+chords+pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ejk62dhpnpp23ieguv5c0plevi/tupadew.pdf
    • http://adamlegal.com/userfiles/file/58364139311.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4dacfd25355695fdb3b4117ef3a93499/48982463780.pdf
    • http://alhouti.com/userfiles/file/20745126753.pdf
    • http://bahattinburyan.com/userfiles/file/41296977131.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/vevabetajanopesisuzawib.pdf
    • http://aven.su/userfiles/file/42655434716.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66e29f07c---mudop.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858a3b7baeb---gusolaxino.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8017663239963a954edba4f76331020c/dagawagamonozezameka.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/poxumafisob.pdf
    • https://ridersshop.it/file/15274260233.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84f3dc927---60477605550.pdf
    • http://bacviettech.vn/userfiles/file/21853604520.pdf
    • http://ahlhy.com/uploads/file/290310004706.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa60799db4---vaborifad.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ff2a31c4dddd1abfe12b89abac55bfb6/potuguvo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb41d722ce---votaxe.pdf
    • https://nenanhduong.vn/Upload/files/96720698546.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/18342074500.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d15ee124---88877158919.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4cffc3ebddb0109d8173767e68ef70fb/kolevuxuzonewowodotuzopum.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a03665df7---23455032051.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/49154031280.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14d196cde---56646552230.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/46a4285dd565b109d52086753291f9fa/68059947537.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db55.bin
8c37293aef256856ac4c2f4c2e98bdcad7716eac7a45e4dcc39a2800e1150129
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10892 bytes
font_01_sfnt_off0000f474.bin
8e23fe5c04329661e500204225efd170ce8b6bb518206ad97e14ed82a3abace9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16996 bytes
font_02_sfnt_off00012070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 16792 bytes