Malicious PDF — malware analysis report

Static analysis result for SHA-256 d594a1639fa28cc5…

MALICIOUS

PDF

73.8 KB Created: 2021-06-26 17:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1033663dcfe055e260da4adc19ba2f4 SHA-1: 96357a6e50121579f31ff9e08147ad56afd56416 SHA-256: d594a1639fa28cc50d9f8ca6c795df9c19a139ff79271fccccf75072165c1c9f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. The presence of these links suggests an attempt to lure users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://arunimaflavours.com/userfiles/file/kidatoselorizevinefusod.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/157c4a7ac640c009cc746b5ee72b0801/sipimuwabo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b455bb6d3---26325319473.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/89984681009.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2e66749442ae7ed5a9bbcc4e9e1941e8/guregunenobikubukatelot.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec4ce2d07307c186466fdbb51f83a67a/ribaremonixu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/47b8b4b166df18987369b1ace24d7c12/gowidutuvilafobifuvobe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ab3509f9---sanekukifilogajupokugab.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6fiqn3g8aeeus4b2q9mgrefhul/kajikumexesizinegiwebino.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/liraletenugisuzu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/242fac8ba0ae8e11435c2b9eb434b1e1/kawarudujamopixoli.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/84097094738.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/potaretutifabodagunedabi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bde9cf5f15bdb69009711ca515bda8bb/35766752576.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f4a8612126857be2c3e919bf8ea709e6/balam.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210622_142331.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dce655725---68263971679.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5f3beb99---29256087420.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c376e2bbdc9---99840130039.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/74051875655.pdfIn PDF document text
    • https://beaszemin.com/files/29735415404.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7ae6a9f37a2a7bf06688c21769f6002d/49061148580.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/15981429923e3d1ce1522feb0b81fbec/kexoxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=types+of+resurrection+in+the+biblePDF 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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 10732 bytes
SHA-256: 496845534f88833caf8b632f7edc43100bb2083d45a99eeca5e44ec3de13ecbc
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16356 bytes
SHA-256: fd81359d5625f336f9d1f38b1e457c986aaa4dec7b6a602162ea42bd26938c98
font_02_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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