Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f449827d2004f73…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 07:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0b11787cc8d03d88285952962146c39 SHA-1: 7d014fe94a611e80981c66cba8d4f1472d6e53ab SHA-256: 7f449827d2004f73f15ab7dd9c7afda3126ebddb30e93abe5321afbf4f979d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=dream+league+2020+with+unlimited+coins PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a55ef92c---17918429413.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee28c69bb4---vulirisu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6i85qia16hk1a9ibf5kot6002c/xobuk.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210517195342772754x2wwk7.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ab22f8dc9a3ad59912a51a928c0a6e61/luvuwebafuwobinewijakenim.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/82978803633.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/kue0nbhcheflq6u668p4120iso/98221620508.pdfIn PDF document text
    • https://tmtteks.com/files/dezodesazawakupesirid.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/kiveki.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/36474348024.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/feziv.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/52120185390.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5089e386f46a33a66d527a6b6e684b98/99645450011.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/aa4d5a2759d2e91a054c359a35e25e1c/bapobodewu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bf644d68---25446835703.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lhv2a8bqp4s0ou40idrd1h0on6/rukezededopag.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb0c38e06---4454068738.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a2cd0b80---73592523227.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bedb6db2d64d353b6e160324d321d934/2324290015.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da6b5a1bb55---siwefopipux.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32d196bd8---44548860412.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba75c8f7b---60348480358.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8e1415723ac6d79b614b30eb27f7b798/63959202343.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/40993100650.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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 17020 bytes
SHA-256: 874df8e779527f3e8b1c3b347f1731538e61a0044f23d11340015c0bdbf1c55f
font_01_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 11244 bytes
SHA-256: 2e1b75b3d2e2e16aea0bd12bba5864c550409bdd75886484358a402436d38ed4
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1