Malicious PDF — malware analysis report

Static analysis result for SHA-256 55630440a0d99595…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 01:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9618da3029d2c6fde09b51244d11722 SHA-1: 04cc8c92343cb9a107b54bfd7df8b3d07cf03ed0 SHA-256: 55630440a0d995952edb66c0c42e1c42ee4e6a587733ee33ffcebfe17b7f033e
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. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oxigensupplies.com/shipinc/userfiles/files/92885446390.pdf In PDF document text
    • http://tyextractor.com/d/files/93626867331.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/7461841860fb75f91d51b.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160707859b3505---zalavuvafevekidedun.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/n2oalf9l142855m8otojiai6e6/87275233725.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/98454651025.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ea21903b---texurosotulugelujir.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/phn0uejde3rre60bktt1n34fsb/tojebejepalujilavawotofox.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da6fba2397818f271a5b0cc3ca48dc23/94756803577.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b877df77cc6---7565327564.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611edc5a62f81---wigijuvakezuz.pdfIn PDF document text
    • https://svltv.in/userfiles/files/dilasagakonidib.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106fb84830ea---woserokumewatedibajavopek.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c78fc4f8ab5e442064fd848e07ef18dc/wigizuve.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091caefdef96---61641981431.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/39616746228.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/8318415627.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56003137109.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/96055871070.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8d854279---fenodibon.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/72597616769.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/getiwakufaved.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c098d5744---xulokijopoka.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/92966669135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=6+pack+cattle+dogsPDF 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_off0000c7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16020 bytes
SHA-256: 1118750ef320d0f0522a8db5ebb1f5c9c300996619b20886d4cdee304d3fa512
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10556 bytes
SHA-256: 80476e345905ae23bf258ee63a4a46982c60c576e0974cd1ad756ca6d6945e4d