Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4a6fd2499c3a0e…

MALICIOUS

PDF

90.1 KB Created: 2021-08-20 00:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3fd33731f6bf49d4670451b6792634d1 SHA-1: fc04cdeb9148191a5302e33684cf24d017244eb7 SHA-256: 5a4a6fd2499c3a0e09b49b2a1853d300fc5fb0e64e7df540b481995eacc8394f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://podushka.by/files/files/4543957448.pdf In PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/af0f6f38d741239c7265608c4acd4625/fizavenidebetetefa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dilolojegaleno.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160780c0853d8b---51004361863.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d60453178---wajapesezuluzidexotu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beffb2210ff---mabegazeni.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/58502208677.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/92a4daf35b4bd5c94bdaf57528642ced/mirebuganasu.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/rukuwuwonaxalemop.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/24953819752.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f82b7e43f---buxovewibipokivumof.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d061eba83b5---mizuwovugunofezumolidewa.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d92580db8---wopumebab.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/fikuvuzaxewogevofebex.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/78771629148.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/397998d41288e797f00e5a7dd2b4d92b/sijunumagarogatasi.pdfIn PDF document text
    • http://synfarm.com/upload/files/tukozatitezizuposi.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce1e4a581---lazudakejerukufolume.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/15546415213.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafaee005b---40029685439.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/xafizusolubadosa.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/buxudifaxo.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/sebuxamugejuvodamu.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/begej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=diccionario+frances+pronunciacionPDF 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_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 19336 bytes
SHA-256: aeac37f52f4d6047c27bc49b54bea81fbbdc6bba2419fa22b03ea890e78a8e4c
font_01_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 10432 bytes
SHA-256: 10cfbb7022f27b6a79619599e6457926933312aaabb9cf2106dfa9738d5ff1dc

Open this report in the interactive analyzer, or submit your own file for analysis.