Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efb0e4de56981b9…

MALICIOUS

PDF

88.2 KB Created: 2021-07-25 18:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d8212b6458aa94738c7fb5af610cf0df SHA-1: 189e7196d7ccd34154ba794b0f26cd26d164f8f2 SHA-256: 5efb0e4de56981b9238e463a0ed8dc849e7ad17f1b0bf3ea9fc4f622a838bb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32239874f7---refan.pdf In PDF document text
    • https://defrokatilai.lt/images/files/luzegowo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4853bcde---latovizo.pdfIn PDF document text
    • https://go2germany.ru/files/file/326160716.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/94269268539.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d354219abd8df033ad965b8b0c39d2bd/kuvulojijetol.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/97dcf6d393d9c38949b959d2ad7f7147/10201968545.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/kufunijagonigo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4756b4d4160db7aaef1f91b291286cb3/tosenuwagebanifudevitopen.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wufaxinufulubuvore.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/visepegobegebi.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jugenanedul.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/wasapekerujug.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/385eedb0be2f4349f45e4104404777eb/sepugufelepezogofarefese.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f12bd076a---polatozatuwafepejis.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084750ec275b---femizorejugimetewi.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/218a6b9259e142215798a11cc9c8fb1f/70573001081.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/sinuwotexak.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/kbuspv1thb9bccnqcmg4v2f6s9sf4f82/33282751761.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/35817799944.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/gimur.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8880201f7fb03d3e1284d3ab12cdb606/zupiw.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec892bf95---legawete.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/mawuriwizuvonu.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/setepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bloons+td+battles+unlimited+money+mod+apkPDF 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_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 10952 bytes
SHA-256: d6e7005f289096f3c8a6803256310b70d109264d72ec4e0ce84a6c64cc510452
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 16588 bytes
SHA-256: c36b957f2690b413283607fd87b6460a3a620684d240d514ecf22abedcd9b80c