Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fc570ffca8a120…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 23:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86201aa09418b70f5862f97c3cb2abb5 SHA-1: e9c4137bebcc796521641787e29c67ab28ef9404 SHA-256: e8fc570ffca8a12003507010e1cc9e7ac031f3d0a6ff00bac9fa18082df4fbfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely to phish or deliver a second-stage payload via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alphabodysupplements.com/newerac2c/userfiles/file/67041585930.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb32d69d70---jotidoriwila.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ae7103a1---8178323177.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099d37ea0335---40161555029.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/lesawimepoluxu.pdfIn PDF document text
    • https://rosycaffe.com/file/81219967634.pdfIn PDF document text
    • http://iltorg.ru/upload/file/81298318134.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/xufexujujagoravodab.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zulugoloj.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/10859878728.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nejesemixur.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210815/files/20210815062512.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f7fb82e4ba4320970b77665d6faab349/nemudojunifowodezagi.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/toxemivi.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/85549811796.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/fujonujobada.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/tajitulal.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pqpfikbq1af942nfvjfto1v3r4/72908279931.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/42256076312.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf43b5f90---56029302345.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c64824e4e6d---90760028479.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2435fb1fc3bc8efaeeb777eeedb7a71a/96088025390.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084db6dc9720---rovororilo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gapupunujugonilemujaxifuj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/aja02srafuvphsifnmms4dgteg/mukodapele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=strength+training+anatomy+4th+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 11000 bytes
SHA-256: b2bf74b0d2bbbe229478fb2f83cfb5fb42342802788cf024f133c6e37e18839a
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 20984 bytes
SHA-256: edd303d61606156915437628c5971318c2909852578597d684fd24da6d1f78cf
font_03_sfnt_off0001439b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439B 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d