Malicious PDF — malware analysis report

Static analysis result for SHA-256 843cb67f28eb9399…

MALICIOUS

PDF

93.5 KB Created: 2021-06-25 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f81ab9f61467c1ef32c43bfa45616299 SHA-1: 1d2277c52fb9c9be392bcf60404f6f091f730d96 SHA-256: 843cb67f28eb939905327be71915789bd4e6eebc2645232294c1a3534d9d7a72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=minitool+movie+maker+android', are likely used to redirect users to phishing sites or download further malware. The document body was unreadable, but the heuristic findings strongly indicate a malicious intent to direct users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=minitool+movie+maker+android PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c202f6ac7f4---patedo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ol4c08jreitg5665t9gj8drd6/68745778325.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c532bc8eef3---92749306497.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/edb5af26e0f02a64fd00802e7456b402/61102006193.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6989c1efe3896fc7905542c21a6f7117/lejupe.pdfIn PDF document text
    • https://seerupit.dk/assens/file/waxapadowebugi.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160860e3ab3194---75258699799.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/sililafuze.pdfIn PDF document text
    • https://123natura.com/stockages/files/bazapuwadobaguzubofe.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o3e57cvits3io8kfm8r5r1mjq4/noparodozokomusutamoxod.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/32269512927.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/99753246293.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607891bc7997e---30750860520.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755ec8db7d7---bewemusezozozoleseme.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4e57fbdf---luzetorogu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16188 bytes
SHA-256: 4f623651a06d785f9c0c1dc00e6f794c4d611a985815d1a697ea729cabbd2bea
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 20436 bytes
SHA-256: c4288bb42ab7ee13641450fe4168769b22ea2c133525c4ddae3bf2d33287ebaf
font_02_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 10392 bytes
SHA-256: 8da77db3381b1754c0aa296f9b2771fd2d30d44346a427aab259e38cba06ad23
font_03_sfnt_off000150fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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