Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27939b9447fc51b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 14:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b052cfed8c7ecef67455c31122b3e85 SHA-1: e1c0f1a08bd23bb3481672a7add860dea5d8f3f1 SHA-256: a27939b9447fc51b54b1a5faa7dd44ff4f6604b69db495c7ddeaf36cec8ad991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on various domains, many of which appear to be disposable or compromised. Heuristics indicate the PDF is designed as a link farm on disposable hosting, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=making+love+to+you+quotes PDF link annotation
    • http://thailaundry.com/imgUpload/files/8588370946.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/monetufipatojuvunedev.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///59171899853.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210923205136.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/18517150803.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/b1tq67b8u9ngrbuartn8kj2sut/27405710697.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914072823241108.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/56614943286.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8330e7c393fead07ac37c8cf73bf1698/6318987507.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/razezub.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/masutu.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/wubuvipenavomubibuloba.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/komumo.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/biberatak.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/53564620364.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2381d7d38f45c85b481cd8fab2f73e6e/jisamukixodola.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xemozobowabajirusa.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210921024958.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sugikuvixadedere.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b094a8b27---53795282721.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/71213279952.pdfIn PDF document text
    • http://lachina.cn/upload/file/13249562631.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/57874906299.pdfIn PDF document text
    • http://ping-property.com/user_img/files/91762282458.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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 15568 bytes
SHA-256: 44f326caa64ad5e46cf6022eaf417c47e5356a59d02437a212b4ec3a5d55bbe9
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 10692 bytes
SHA-256: 3f9c7bf63ce45fa846cd435726b3fe76b424f6fc53e68afcbc741bf09f5a1b4b

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