Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9745b8494c2ce7…

MALICIOUS

PDF

85.9 KB Created: 2021-07-14 08:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14c23e96a1081ef1248294b29e527588 SHA-1: da6769b6b869bbe2bbfcab66eb898a5c31d8733f SHA-256: ff9745b8494c2ce7854f6f02462f4a83f96d076e56c3cdba25b20adcdf38a263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to unknown PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chmelo.hu/sites/default/files/file/xibokir.pdf In PDF document text
    • https://haidangpc.com/contents/files/35063694759.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/137e4373a2c456cebf2bf61790baca5c/sawomub.pdfIn PDF document text
    • http://18554080.com/userfiles/file/58300463832.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/85412578131.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/fenovon.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/84757433963.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/69022180995.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/03d4bf7e09c268625f4f8168ea986dff/nemosazube.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/98918539383.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t5asifliji5eecol07u54a23e2/fabesomiri.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/najawo.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/sajekisedemujov.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ucgjl10c6tjsn7ee57t9o3ba5g/78183720599.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/1896684214.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6915ad38---pamexupoxepo.pdfIn PDF document text
    • http://adveotec.com/img/file/woxagatumizenejafejedi.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosafedupivedikatuku.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/60597252520.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9375c342---50151092158.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/lifiwazemijokudobabepox.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/venanepureponepajime.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/puvimibe.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/6552965391.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806514f2fa6---fedukusozenufozujogaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=welcome+to+the+poor+side+of+townPDF 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_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 10804 bytes
SHA-256: 0e1c05202f14da94e869b2bd826af1c23806676c671380db7a4223cb2edf0f84
font_01_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 17360 bytes
SHA-256: 305d376267f27bb329604bde997ba3b97e122e0f2baae9d839f6301e38694ffc
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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