Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a27de238c14f94f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 04:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e90a46224e08469cb1c7f7ac1de3f2b SHA-1: 63a484bcaa09593e89c895de1db31125549c1898 SHA-256: 0a27de238c14f94fc7d2db34cc4352adf5d1ec5079836ec6eb9ec5e27606d0a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to external websites, including compromised CMS uploads and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://zubrcup.by/files/files/rewirobaruwoton.pdf In PDF document text
    • http://foto-preiss.at/upload_files/files/devularepetirewofamizapi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4ca97d7c74ae740900bc22b5c99b9f77/luwifamawefutu.pdfIn PDF document text
    • https://datajournonepal.org/files/85682234445.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mawur.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/bokeborusuravojosun.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907203202012.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/nafezusonomulaperidajuzud.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/fataluselefas.pdfIn PDF document text
    • http://wmsone.com/eimages/file/numukuwupuvida.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/53191302398.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/14735433363.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/62ee8e63896edfc04046628d65c9b635/lozedejudezunazewasodiloj.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311408c5f2a---medof.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/718ee123b72e482a1e0f762a130f747d/9092213286.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/6558655502.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/39691061021.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/pafazosuxisuragobabipoxi.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/84573905206.pdfIn PDF document text
    • http://flexa.cz/docs/file/pipaxeketuzoxiviwek.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/rabidarubor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=red+dead+redemption+2+book+pdfPDF 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_off0000b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BE 15388 bytes
SHA-256: bc16aa6e2a3dd69e19e56bc45daebf17bca18178c50d30b2be4262cd4f37e9aa
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10840 bytes
SHA-256: 46b008a32ba88ba1912c36122f43c60b3490729544c13932667faf36569fbc2e