Malicious PDF — malware analysis report

Static analysis result for SHA-256 420aa6a42db5ba22…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 02:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ee1fd93bffe56edaf7eb4bf50ee5744 SHA-1: e4e7fd5ec3498bfd9e61a8a741a6ccae338c01be SHA-256: 420aa6a42db5ba22dd8f20643bf81a652590d357fb82fb4be426c46ca3df77a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/961ace65c84243cf136a77673d810d3b/88245165500.pdf In PDF document text
    • https://lawina-radom.pl/files/file/nodofumasakizora.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18845e744---47141994111.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pfknril90jmpu1l1ilan3tvqjb/31009425009.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a869d69969---lurubavij.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/zekusir.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61b558edc3---gevepijiges.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55e3eab7f---tozonomozezofamosoxajaw.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/20489d56b8102d997d63552add9672ca/sonojisuziweximabepigut.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160825bad8ae52---7062582251.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zuvevamime.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bad912adc5e47f2e3c6887b2726d772d/jinarapedimagevufiz.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/8237575645.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c21714181e6---83924545593.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/65553210655.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/952b9c6867a707aaa13827987c4fff52/15182552580.pdfIn PDF document text
    • https://digireg.org/upload/varakubinasa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609757700a717---nojekoxusitedegu.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/mobubunifuz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ac749620---25921374373.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1b579aec---geminetevitek.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/86128109343.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/186f6889538815e57bea2f5c6062067f/vaxikogeresutatemezuvil.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9fdcf114---40430197891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=adjectives+in+sentences+exercisesPDF 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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 17440 bytes
SHA-256: 636a95c04be8989c5d9752fbc32d7a736d41702e0a313a9341b8da8679fed632
font_01_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B9 10316 bytes
SHA-256: c5e0fd9791a707b54acca6f7edae15993a8486bee30850d3dc28876f34fa5da9

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