Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac08383c9be7ec9c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 14:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e500f76fdd8ea553414291e22cd7569 SHA-1: 44ade22cbb4fb1921ecfdbc20ca90e56b7f40d72 SHA-256: ac08383c9be7ec9cb320f1cd772eab7c004f7037bdb423b25bb6724f03c4667b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=prayer+to+be+faithful+to+god
    • http://rubivina.com/Images_upload/files/74710469757.pdf
    • http://mestav.sk/uploaded_images/file/misen.pdf
    • http://furniture83.com/upload/files/zowixakunoxegitifo.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/53bcae5087832f5527c04bd353179ee8/71334469153.pdf
    • http://sanruou.com/app/webroot/uploads/files/96644769399.pdf
    • http://systemsbiology.at/uploads/assets/file/bijukikufulediwuzomo.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8188e4073801653d86585de1130279dd/nepusisirurijaw.pdf
    • https://gsm.company/ckfinder/userfiles/files/laxorewivetapiraxipovuno.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9733cad5---tasebosujabatopu.pdf
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912194712381120.pdf
    • http://ipea.kr/userData/board/file/zelepadapaxokulerufegipu.pdf
    • https://fortworthdental.net/cmsCart/upload/file/26824450179.pdf
    • http://honeycontacts.com/uploades/userfiles/file/jelere.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/2bdae2e56157a9d43722e24e658d7ca8/fiwenepumepadut.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/10678397824.pdf
    • http://topoint.cc/userfiles/fckFile/20210918121528.pdf
    • http://mottaing.eu/userfiles/files/68811553576.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/64388baf9a37944bd72e49f3d8266d83/211414608.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/39425343372.pdf
    • http://patrick-vallot.com/upload/files/80640103634.pdf
    • http://canhtoanland.com/upload/files/61483721265.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/293d23e7f3a40d0d5dba3384c3d2d2d6/mojex.pdf
    • http://atmaircenter.com/lb/userfiles/files/72486742467.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33c.bin
3087f1b7a486a1d1bf5c85ef63f6607806909293e11379892513d5be878b452a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 10716 bytes
font_01_sfnt_off00010bb8.bin
21cec0878e757865af00f6f3dceb0a94dc2e59893aa98309f72b86935b5cd727
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 17644 bytes
font_02_sfnt_off000138e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 16792 bytes