Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dab0a7c4adaa39…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 10:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82ba7a148971c3e50d43fa8c9c62444e SHA-1: a37ee5f42f3feb51aed1b0eef9ef656bb09d2043 SHA-256: 85dab0a7c4adaa3959ab76a6cf01ec42081177546ae325d1e60df58b4da73b5f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm used to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8c0d7dcb7dcabfd9b0d596853d56b881/42663312572.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160823d3a86a35---80652616196.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///boxulokuviwi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/766eoqka1tkqn51ttfjbdpsgs5/71775992482.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/55058838202.pdfIn PDF document text
    • http://riversedgefm.com/files/file/41841892741.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/huvmgi81ou54d5de0dqlmrikv9/fupanusut.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/m1u6n6grvqkuplb5aptgk53ck1/71035075771.pdfIn PDF document text
    • http://siembra.me/uploads/files/buwosopiraromiwik.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/07s5akhh3lvju1mtks4g23urin/40812164157.pdfIn PDF document text
    • http://df-foundry.net/d/files/gaberezenegopawobosumis.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/cd7e9dsiqvaakib1pfiu54nev3/pobutenupe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed2da7e4d---81909192427.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dd85b9dc---47573969885.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/xajemabuluweb.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/90tb5l985vjicd5udo79jr5lc3/43098142037.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xevimux.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/25037235844.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/77042566134.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zomadezubapita.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gifiruxebanubogijo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dazoxoxopag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vertices+and+co+verticesPDF 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_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 10352 bytes
SHA-256: 0accc29cd97ef91792c04f0d4b2d30f62069edc2e1476b1c2cb18fe540c3a46a
font_01_sfnt_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 17268 bytes
SHA-256: f6be19747bf7a9fd85f997e7faad0f1fa49f7d721e64e5951d9ea571364226ab

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