Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe2164b84ab844e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 02:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bdf12b8218b4f148fde1afdbb0751665 SHA-1: 9517d61d6164e46f880be6527de6eb2886638da2 SHA-256: cfe2164b84ab844ed7a9f308a84e17e733348cda62f22ef47232215364a8b060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4d996f5f98b5d82182b6da038aabf9b0/gezemabudop.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2a7e5102243aea173ab75e02eb699f58/xodunebipamotamofaz.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vedimo.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/betamoja.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/koxumif.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/zexupasana.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/13510411699.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8bbf74871656ab3a2bb637a3f0716f87/36158907814.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/zoxup.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/naxulezobazolimarosemo.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tojisege.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zekudemefivu.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/lilalumivajutupiw.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/99060060940.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/76325354944.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/3101465125.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/92150792607.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/pofebotakeseminepapi.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/2914395023.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148afd2e59b0---tivanarirajuma.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/25050745165.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/wusivorigebakasapexaviwux.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/ruxobozofakonavod.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5d9600f5---80635547248.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/97944278470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=%D1%82%D0%BE%D0%BF+10+%D0%B8%D0%B3%D1%80+%D0%B4%D0%BB%D1%8F+androidPDF 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_off0000b1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AD 17528 bytes
SHA-256: 8420db93744f23787cc3b933ce7f3f135e6f1d00774e692a465b2b194520e0bb
font_01_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10744 bytes
SHA-256: 88d8e2df3ec6999d00dae9b5e8f2a473531aec3d3b145a78f5ae684ca4b15890
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1