Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed364f13a50e27b9…

MALICIOUS

PDF

86.5 KB Created: 2021-07-16 12:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5523bf120daeb57682243edb018df4e7 SHA-1: ee05eab3c2dd9128e9b15360448683287c276d2f SHA-256: ed364f13a50e27b9697e8e8348395ed3f7b1f81de9febb0b196ef4d020d0664d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection campaign.

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 http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4f564fcf---41082375042.pdf In PDF document text
    • https://whiteplacard.com/UserFiles/file/61145641997.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/wotumalinogeritegum.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bubixexuregogetutotebobax.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/jomuragoxodapuxalo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada931e315d---99027760223.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210706_AFAFDAA71D5CFDA1.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cae1524a---powidivabekopunabe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/449d36d6374f0dd6f49a0f61e7bf0810/21207251432.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e82c1a1ed---66153825573.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa478d6e8d---79243688580.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/loweraruluwigolitadiwe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d0521ce8a8dc0878f1da17d2a0d07c0e/83486901644.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/78879263223.pdfIn PDF document text
    • http://kotolantopeni.cz/file/99871892054.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/82618850286.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/64221835542.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a30b69941b4ca2b2c371c0d9addfd424/lavoboza.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0871963ee---5069311648.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zegigejisanulolav.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/56013135712.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/vasajitopejusuxosu.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6044d32d9ae9ee7a89712ce1f04ca026/47206707020.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c6c3473d230a92c4aae955e527b84881/gusoga.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/75825409773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=independent+assortment+occurs+inPDF 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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 17112 bytes
SHA-256: fb5334a6b2c991f81af8d12f99e3a66122f05d0dfa8afc912bc26b505eef5d8a
font_01_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 10680 bytes
SHA-256: d09bf48452044540f262d2753a4e72f8361af515ffdd1e54220ab98c1a7b7c18
font_02_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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