Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc3973af7dfa6a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 15:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c33b63b1dce455c783a78c851ad7485 SHA-1: 918240480e7d8a428eaa6dbba3cfe2acbfdfc0c3 SHA-256: 5fc3973af7dfa6a443d3d812c3045447c6367a3d339fa27c4b70d8dd94e38378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=2012+buick+regal+gs+manual+transmission+fluid PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160759e965e320---69785634947.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/u6vejpifiscpc5bvgn5o2pmtsk/vutuv.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d5oompg1tmqrpcum47m4778b24/weralej.pdfIn PDF document text
    • http://1careglobal.com/upload/files/zajerunesuzuloj.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d88534f6f---5370657651.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/dazajesufobidumimafaw.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/67653921618.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/serixejutupagewuguj.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/nivasevudanakisezebivu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/refoxedujut.pdfIn PDF document text
    • https://wita.lt/images/files/dolagulugudo.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/fanudumi.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/81363437211.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/55458260322a787c007b6b1e9ad89ef6/87100549466.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780061446af---xitemafajinuzovugigizifif.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/liferilapiza.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/47842416434.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/24942184548.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b442bdebddd---jibosaneladakawosixun.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/xeramekimadowutidurivoveg.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ed8f1a21e262054e6a30e40cb1362a6e/siriwoteteburetizeratefov.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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 18080 bytes
SHA-256: 16d6b8e381d01f668d9e1620008ba6041b449d1e0805ddc27b64f3a67f56e79c
font_01_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 11348 bytes
SHA-256: 1ba70fb0aa79a8611ee1c2544bc199d825e565cba026b79b645370cc0a384531
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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