Malicious PDF — malware analysis report

Static analysis result for SHA-256 b743d3678c085e16…

MALICIOUS

PDF

93.9 KB Created: 2021-07-01 00:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5abef941fd42db1eaba3c50fa4b6fbb8 SHA-1: dbb3e5a3d5649c60388f8cbdbd0264ed5c396610 SHA-256: b743d3678c085e1657b60995714f9101597756c65e38d8d59df27444c31ff051
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://catamma.ru/uplcv?utm_term=period+5+ap+world+history PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bede4c98dfa60bd8497ff6cc80dba298/kukagumudosimawogate.pdfIn PDF document text
    • https://proxus.nl/file/bafiw.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/79969790869.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb397ec497---97773150829.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/32956049485.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba04a9f1b---kokuwenu.pdfIn PDF document text
    • https://unosms.us/userfiles/file/10324728416.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63819690a76288945ed7085149e69fd4/bidaxosal.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/ranafezaperemuzawelo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e28c42744---71553767508.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/7nt6iks8uvosekpps7j5299jng/26929586719.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58052988918.pdfIn PDF document text
    • http://metapolar.hu/tmp/87148248917.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/19578114475.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/20777179988.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b0or0tvp54h1qqbqotfm51obga/subasokebabodusin.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f0gjvsp1b1tdu18fhb4r3i0i40/gidup.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdaac24f03---suwunomesafimekimole.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6b1c17359337aedd6923faee6848c521/xonogawu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/82a9885346cb8dd9d424b262c7a3b791/gizerot.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/397e8992e57593297f5d6cca640dbdca/38005947469.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/89398298508.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce2044d54---27966055268.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074a8eb61857---62925455479.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 18348 bytes
SHA-256: ddeb5a2bb32a23e752742eb966e266fb73a3a3f5ca7344e3b3c0f9d8ee6dfd86
font_01_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 10720 bytes
SHA-256: 8b0684737abf1353a46fcd49d51d4f3a82c7cd48453e66d0b254068511a1d50f
font_02_sfnt_off000150ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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