Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a4da7de44ce133…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 07:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cbb5ac52ee0dd091e2c5ae18888ccf5 SHA-1: 11283807ea2b7ba790e131f08b0835795e6fb6ee SHA-256: 04a4da7de44ce1330347b2234b373956decc1cd753a100a887a67571a5a31720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and the overall structure point towards a lure to external malicious content.

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 https://philabc.ru/uplcv?utm_term=choosing+a+research+problem+pdf PDF link annotation
    • http://pronobile.de/catalog/file/4291612677.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/82596739081.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde5d59d24---semibokoxokozelebodaxid.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/rexenesodebukudosod.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/13360567917.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/af4b7e616f3c839185a69a4eadef2249/42949849096.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/98271859102.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/54734916475.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/72868326115.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210518215349.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/61198142378.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/85600893040.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2332ed3375---64920365595.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc12df85c---1095514017.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/xoputetemevux.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611cde3b02f9e---22990518820.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/dupufovuvekafesedeb.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/sikunovetaxa.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210719_074A189B7DFE8191.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/todavopefijadik.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/85b5be58fc9fff25ede6875208627087/zelolozumafoj.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/95798995094.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a709b150b82---34211887518.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fd7e870662cf1c2444d54350f78b90d8/28719158002.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_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 11140 bytes
SHA-256: 43cbe76a05910feca19fbfc87754dbba55f039ff0ab06f62ef6573d41470a26f
font_02_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 18312 bytes
SHA-256: c96164fe2af1d118ffc7cd015145aebdac0f78b8316ba07ebfcc48507c9e4802

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