Malicious PDF — malware analysis report

Static analysis result for SHA-256 836e7c351fe53dd2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 04:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 338d0b5e42b5bf7ec6ecb05bf62a3acc SHA-1: 19dab4a561ae63551dc7bf97e535ad269bace64c SHA-256: 836e7c351fe53dd27b3f274e60db377b532be14855d788de59706a812eae3086
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of 'cmd.com/data/files/muduz.pdf' in the document text indicates a potential command execution attempt, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f17776d76---xakejimenirunorug.pdf In PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/jewafisikebafimotat.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb8a32a56b06758a317b74cdbd9c16d/maguraxemixuwirovarezegon.pdfIn PDF document text
    • http://qdcmd.com/data/files/muduz.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8043f9f5395beef6009a9970a1c8aa00/3976239714.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/23473334845.pdfIn macro / runtime command snippet
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160812d698b496---76888512342.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/99728873c2268184d752f267d38d1966/94908835615.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d9811282bf048a822bda6ace887228dd/73339212383.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/11888216556.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/nonozutitulijanobapedu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b770707c629---gaxupalufilawuvenosu.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/fulasudefoxuzi.pdfIn PDF document text
    • http://ktcz.eu/files/files/gejafemumibanilam.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc70d762db---rodamewugom.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/31249205071.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/zazuxipa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa1a961a15---63737675508.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zidibozukusomovaxufimape.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xavivaso.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f2886e17c6b33ba025c76b756be4846/19110717678.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/27743766603.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/tozopuxak.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ca8f093b---61326031838.pdfIn PDF document text
    • https://mytutr.com/wp-content/pIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=general+knowledge+test+questions+pdfPDF 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 11136 bytes
SHA-256: e862859db3b97e488525ef9e6fe8c0dd63d8873815ebca0b5812dc74c73188e2
font_01_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 17424 bytes
SHA-256: fb79fb98c5636e72dbcb49cde05e8e32f7dc83eda87a2eb9b8ce7e503f369e76
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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