Malicious PDF — malware analysis report

Static analysis result for SHA-256 4734697003c4c296…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 05:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba1953bd2fa91f3a5b405afc576b82e6 SHA-1: 64589d13dfec50def45db7c54c842164ae3cd8e0 SHA-256: 4734697003c4c296c0762f18f02196306019b2401e941494a58c1edc5028fa5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://parkettworld.com/upload/files/kajibos.pdf In PDF document text
    • http://imhome-listings.com/userfiles/files/golafefad.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161448f5d1a879---rutunabam.pdfIn PDF document text
    • https://jagominum.com/contents/files/56202808655.pdfIn PDF document text
    • http://schokozentrale.de/idata/87538759849.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5d4d70807905ccc4c963abd35c5c6084/90096571455.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60938674359.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/85342672120.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210917_092540_163.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/vimetipoke.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/48597870669.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/80714049463.pdfIn PDF document text
    • http://hidramaco.com/files/files/wajosaxijob.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/42087013599.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/70835381169.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/zorawodelusiladuvumopasad.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/54227135253.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/76993026742.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/50469035365.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/buvonuximowepetetesilafit.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911154557.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5e2d7c0ceb0945539af1209aa26eedb1/pitotepefus.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/99200788877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=app+store+apk+for+androidPDF 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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 17312 bytes
SHA-256: ccbb2a10a518b0dbcec41ebb643e6bbe7e0ff03768d0b7a1ec8b6551561198bb
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 10516 bytes
SHA-256: ba20ab2a644a9013729fcdd1842e775875b0045f10822fc53c5f246972ccf7fd