Malicious PDF — malware analysis report

Static analysis result for SHA-256 a902e28e8f064f0c…

MALICIOUS

PDF

79.1 KB Created: 2021-06-25 22:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e206b37a3ba882b8df37f69b1f0aa095 SHA-1: 816f9d25fbd8c1900a6bbc9c1f13e1d65bdd5880 SHA-256: a902e28e8f064f0c724526c540b8e813307a4c7296a73e533f3e2091d0344c18
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm or distribution network. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be6bde9a5---64634878015.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/tvhnl19obnkeuauocg7vdblup2/51639994395.pdf
    • https://karinbentum.nl/uploads/file/49154713078.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6555b39232b4b478b9119b20c256dc1/moforuxadodekurivaji.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105231130365307.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5b3c86ca---nibopebagibuk.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1ipv63pk9qtbv9un05bqvmh837/21422109700.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6796d63e8429beb5e3b502a7f1f9780e/63670102881.pdf
    • http://skolicka.eu/foto/images/file/vuponepebabepowokewurolo.pdf
    • http://guoyangmoju.com/userfiles/files/dudikosemezagewomijupav.pdf
    • http://agendatourvietnam.com/hinhanh/file/18917185807.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/4135434579.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/62814463273.pdf
    • https://tkquiz.com/userfiles/file/86017784074.pdf
    • http://tlproduct.com/userfiles/file/18817471579.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/46905115313.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a6b7e0dd---firajakubipaw.pdf
    • http://titadoorbinhduong.com/upload/files/6865600925.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf8cc78aa---nirojufiwizufuz.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad340e470ee---4775671792.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe513c50d---dijila.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9920ee51693830e6f03d58318ae3e983/jexobevolidijaxit.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b50d6f71599---27428183447.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lab+safety+multiple+choice+questions
    • 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_off0000d28b.bin
919c31eedca5e51a87e7ad4919c1412ef4d8a8c8f5302582b52c68e87d154030
pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 16772 bytes
font_01_sfnt_off0000fd8a.bin
30f4e0e4e974b7104822fa91eb8a8d4a491222b5f536f7354b5581b68b2f397c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 11104 bytes
font_02_sfnt_off0001171b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 16792 bytes