Malicious PDF — malware analysis report

Static analysis result for SHA-256 5481b9636f6c3f77…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 16:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1562cb3d7e46ed41f86d45fed4c3774f SHA-1: b52ba1799e375bcdff7224b7b8343747996d3443 SHA-256: 5481b9636f6c3f776cb111976078f589e0194b9ed5bccc6162b5d9ca933c3e16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains identified as compromised CMS uploads or part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tugrabilgisayar.net/resimler/files/fobemurolin.pdf In PDF document text
    • http://nb-magnet.com/upload/files/danebobatemigino.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/joguxafu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/10887385304.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/rebapitom.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/zawugoxevagirufekuz.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xexix.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/tixofogilazujej.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/osqtq77oo9du9e2k4fdd6quhq5/95042704931.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/75830019164.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/39582264622.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/65833353131.pdfIn PDF document text
    • http://santehnika34.ru/images/file/molixagan.pdfIn PDF document text
    • http://berbun.com/user_img/file/37234277689.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/mokik.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/32e06447d489c8ed3a9e03b20bbf62b8/6421237599.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/2549718675.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144c84145d1f---nepujezagibebubeto.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/fazedupofugevituduwajux.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gobowugurerip.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/babexesawivufog.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lg9pol90j3jusvr0ct8m0n51e1/wudovomarutovokeji.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/98790045892.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/ferojunosegigovatotado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=similar+app+like+parallel+spacePDF 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_off0000b7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C8 10380 bytes
SHA-256: eed5ec02424c42ef2d9c71557691ebd6b4e2b6e78ade20b3c064ac5f5ba5d011
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 15408 bytes
SHA-256: 676418b2e1ac71c469a1a8128d6bf27c30802c0a5e0e46b8bc660b712c74b9c7
font_02_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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