Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9099f6160e6b5ab…

MALICIOUS

PDF

82.5 KB Created: 2021-06-29 15:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 022d565a9b9137d0fc4498f268e15f7a SHA-1: 01598811a255a4c00e1a2d8fdf873d7759271963 SHA-256: f9099f6160e6b5abeee70813011042d483f36b4820b2e7ff5407e16d46db6b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit PDF vulnerabilities or contain embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b358189804d---51108255986.pdf In PDF document text
    • http://www.kilincsweb.hu/fileok/file/wefakigopovologobulup.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xuvevisupukojelivap.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/jorupabexifixizenakon.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c590eb4bb56---76008339950.pdfIn PDF document text
    • https://noddy.nu/images/file/tutajodubuxibimi.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/sasanumumod.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9e1d033533f682e1ed8c09a21ed521d3/17501025291.pdfIn PDF document text
    • http://tochuchoinghi.org/files/12173390344.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b12420bb6---26915882454.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/4888820300.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f3b09438e670b616e639a956d9631d7a/meradawupejozazad.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e5gomkt7vaf17dmds9jv0gkjen/lurabirepawap.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n9bqoiu9knbsshur04j6dkfsdg/77606775547.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/56d07f4cd8cecf2ecaf6fa119a2bdcab/79694091536.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/33617ec6483de21cad0349df6f45454b/naxisonitoruwevonu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4247f9564259dfa8246bbca2f3a7e28d/rarepopenanenolefam.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d67ebdd5---11419020337.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/9236104312.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/22327e3bbdbc21c4e4428c7e331d1909/kunulorinenimewozit.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/72272174326.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bc72aaca66e2150be7934271fc626b09/rabowivegirijojewizudow.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/98760423196.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a566c9537d---zamagitamosebewa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/160712316312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=etiology+of+typhoid+feverPDF 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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 17088 bytes
SHA-256: 93a66477a1e394712111c2109aa2592c4b43a280e09d5b9cc560fbde594fe675
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 10508 bytes
SHA-256: 125eeb17abc3b6f2e631840613f1c31985d991927f3837772dd7569298466607