Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e20bc96ba0b8421…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 18:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f147af1b41e516721ed9d9e0f74f14a SHA-1: 0b0791ab05e0f346e7ea1678d127a2386fd26f12 SHA-256: 3e20bc96ba0b8421cb203ec5f44a4605b5b025b7359f30ae0c8175296f6680c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the PDF's purpose is to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://wastran.ru/uplcv?utm_term=nissan+juke+2017+manual+uk PDF link annotation
    • http://mopi.eu/ckfinder/userfiles/files/95437865978.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/ginixuneb.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5e50e06c---zaditub.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/18482147122.pdfIn PDF document text
    • http://w-mill.jp/images/file/sojefefemawinilov.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/6764398895.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xubatabolowor.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/483b387d91c740941532d6aabd3e8341/vaxibuxidununimimipugef.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608358c63db44---kixaxirixefivavuparisubi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/24290813897.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/71252243451.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/rufelavibip.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/demeletajodoroxopujikix.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/6gh8h7iq6ql1mtv1mi4s1kob7b/15097350665.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/69eda4847212db0c70889ead57d44fda/26722487123.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/boxobetujizogomuvosew.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/79187631163.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4b4b993c86b0df0e28900174ef56e0cb/gapuwuwilavulosegemupig.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/9272780601.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/gusar.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9eb6b0beb---vidubav.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/bd5a8155a25f683a28a9bc1ed8680e8e/borakexipurotelutotore.pdfIn PDF document text
    • https://alutat.com/data/file/fowiserebin.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb81d65851---kubewajukuw.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/s0q6o4eg4qlir4lbqd49k74e0h/51617912963.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/vobanudod.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/49669625143.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10592 bytes
SHA-256: 7e38c46b418b145415d3d74a195b5955a023525b2b19f9078ab753d3ddf59dba
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 17864 bytes
SHA-256: 01a6fdd0ad40171b037887d49512ab620cdbeaf8150b0219844a230b369685e1
font_02_sfnt_off000139a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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