Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a740aaf852b7f60…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 14:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 41fc91c1fb9b84b528e9212125fb5919 SHA-1: b7715deec35f076e95df32eeb988cb8f2274f31f SHA-256: 7a740aaf852b7f60f4c5d2f338e72aee1beab6de824b01b774a44909b57d94f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://newgoodluckcrane.com/admin/uploadfiles/file/zadedu.pdf In PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/butasibikoj.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nutazedulefi.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/pepofigosewulisaju.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dilumakoremetulaxobasivo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f071f90f7d4171e3cb7ab445fd1d3e2f/wutuxik.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/73165293405.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021971156206001.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219912766683.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/wajokovotokutedefot.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/mepajegizajovubav.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wupul.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36802325b---zebel.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/98236754548.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/46547940420.pdfIn PDF document text
    • https://bawauang.com/contents/files/83031361158.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/38331782755.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/37729193311.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b616d53ce59688c1857527d542bc2b6c/metukiko.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/52808663282.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/65570097054.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/rafuzaparedovidokus.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/rusavigu.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bisowenurikubabetabixorur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=phone+war+gamesPDF 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_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10404 bytes
SHA-256: 3786dab1efc0c3d4915b90166bfd62e53cf25c8e67c9791f750830e0d6402b90
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 19164 bytes
SHA-256: a4538dbb8afde106106749eea2dc2478f929c89e0a99be202fc26d036d80c132

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