Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bab679ae2bccc9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff7e9c8394f3242c700bd75d01bc187a SHA-1: 24d5b484eced65f871850943c0b7398f7bb024fc SHA-256: 74bab679ae2bccc90abe7017393156aec022ad28815132e8bd77901f99cbc1e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised CMS upload directories. The presence of 'utm_term' parameters suggests an attempt to manipulate search engine rankings or track user interactions, indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bfull.ru/uploads/files/tidoluwefetukeropiv.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e56043721---80597078833.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ede1a72cd4c40e9dd26737654ad93a1a/62890292993.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/39cd7739b2b118c020c097168e765c06/42219604395.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8789b1f0f---25679994073.pdfIn PDF document text
    • http://ossokahve.com/upload/file/4049751519.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/psg75tccndsflc0frim888faaq/gijisujaw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fdf65a4b---19151797102.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/71129739136.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/36909ad8c26cb324dc18ccb12badaa89/963950771.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/20865429867.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/496f42c1f51422169b43fc0e9609af28/68482431136.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f48ef46638efc69bf488b9b199c6ee55/tesekufuzoluga.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc639d56961---14225724086.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610318305c591---zafazaxonawewo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb6acc1d9---29214741349.pdfIn PDF document text
    • http://dentali.cz/files/files/27676508595.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/54793302735.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/92088687657.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c068f2891---vavulipokunuduzuwotolo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071834c5b898---perawitoputorajikifawa.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/12091066134.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/49488815829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=biography+books+in+marathi+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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 18888 bytes
SHA-256: 4f11d6a98463c30b279ac07ad00a38de860c924e84b4d9494d0d0522a6e99512
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 11164 bytes
SHA-256: 179bf316e35cd55564e987ab465fde7907f1068da76f498e1ecdbac7a29b3896
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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