Malicious PDF — malware analysis report

Static analysis result for SHA-256 412bba02b0532ae0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 19:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb22dfe141f4dc8af63120782dc3fa1c SHA-1: 73eb37fd32a6a61b677af2e595c838d38ef94be4 SHA-256: 412bba02b0532ae0a4fa0e27af19900e4c64ad1d8cb25711af7a1bc5ace8a685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ajisushionline.com/uploads/files/javodudemosuvodudexul.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/61804142780.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/lanekijeterebu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ldvr7pabaec9b477rcsokv1966/medulusewaxowetos.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/63281662191.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/21008398246.pdfIn PDF document text
    • https://seerupit.dk/assens/file/vezutebubiganesarigosana.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a045f166e---bijopedetujizelopexiw.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ff74983---81717954963.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/80022632949.pdfIn PDF document text
    • http://renknh.com/ckupload/files/5062446754.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6abbf3bc0---83096892393.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/79297186627.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/mibolib.pdfIn PDF document text
    • http://afro-safari.com/upload/files/64095527518.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mqbpua5caehgbi6b3j225o3dvc/29124574591.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/furabatitarurobenekuxix.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/loxuwi.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/61801285076.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/63672577940.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8faf53296a---60885387305.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xupuge.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/88721172586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=project+budgeting+process+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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 10960 bytes
SHA-256: 25825dde31a5bfffa92c873c87d4b889ca1c2265ef7725297b4663586bbe523b
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16356 bytes
SHA-256: d27e59ff6e2cf282b79b7c9e866968676a26d15934b8c9bf60d44dee58b51353
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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