Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a3924174493baa…

MALICIOUS

PDF

73.6 KB Created: 2021-10-01 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bab08942cb4cb9bd570677b8d8526880 SHA-1: bd93b3a3d5a1ce71ee942ba877cc2d885f7c8691 SHA-256: 41a3924174493baa9365c66af62fa2d9d1e3947111fa68b1a5c51adbed24f7d2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=crack+dr+fone+windows PDF link annotation
    • http://ducthoaudio.com/upload/files/48901791000.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/23868589499.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353de080ee5---xepijimukijap.pdfIn PDF document text
    • http://zimmerei-possert.at/zamobunexi.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/nakebezoluzumalokexi.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/mozixijisejakarowuvi.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/xibefexilumutuwakibolovud.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/risogoxuvozowabapukigopu.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81332654269.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/jiviweritinazosam.pdfIn PDF document text
    • https://unaizahic.com/Files/files/22504835505.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/vejotudadutukonawoxaxo.pdfIn PDF document text
    • https://tch.lu/files/files/72747132265.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/94048970031.pdfIn PDF document text
    • http://chinahongji.com/d/files/bizidux.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/93543993834.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wabirunaparom.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385475acb08---99907664254.pdfIn PDF document text
    • http://secondary.oksalesstore.com/uploads/assets/files/94495364179.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d3a6fac4b2d51747f13de2419262afbd/89037753067.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wisivoma.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/40583968064.pdfIn PDF document text
    • 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_off0000b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 10532 bytes
SHA-256: c01fb266ee59baf440f74f9887639a534913cba3f06173b215a3a8b500f6d6ee
font_02_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 20344 bytes
SHA-256: d9bcb7ba225073cda4777c128f3632b507bf59ff44ac721a623cdbea945f0001