Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e99e053dcae068…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 22:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd64def46d85b7787861e033063560a SHA-1: be83eb0dea9a438baae94c89692c4afeadb331df SHA-256: a5e99e053dcae06829f34bcdba72e275e29b64f3650275d7b943e634f28f0363
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded URLs lead to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8507e8928c---zotevekadevaja.pdf
    • http://www.sport-konyv.hu/userfiles/file/zeretodokaleweko.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/lexif.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8100c5a9a---10149663276.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/161d28a86f7a38cc3f1b2e8872c39031/57882423962.pdf
    • http://gerd-pollak.de/userfiles/file/topidikovowemodaxeka.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607208e2e6b1a---27517081383.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/q7420tcul1ug919krq5c0cn9e2/11090521575.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b678b92ea---mimonovix.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/992583b051a9db219b84b2601f688c7b/xaduwaxexopukilo.pdf
    • http://akinmedical.com/uploads/file/81331791145.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f771836bff---nusanob.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad655e5c74f---32502488160.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82a4cfdb9---jawanazinetulafuguwedifad.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd5ebbb32---vokisisoguselarem.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/pofen.pdf
    • https://gonguyenkhoi.vn/upload/files/78294990889.pdf
    • http://kibbkw.com/uploads/file/vubagunabipomuvibuvomujiw.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32c99e4df---kibog.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1a6daff6---tidepi.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d7df5fadca0cbc28766492229eb036bd/mekotufagapamezababipuke.pdf
    • http://yorktownhs1987.com/clients/57482/File/63828124401.pdf
    • http://bright-inter.com/file_media/file_image/file/39213783452.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/luribumixofi.pdf
    • http://amdind.com/userfiles/file/bixaxarubunu.pdf
    • http://arunimaflavours.com/userfiles/file/32245421025.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9f1901e3---91794483625.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fz+old+model+on+road+price
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc7.bin
e0560f5a3ef93ee1b08f5d665b8c47758095cfe443ea93335d843b9dcf59594b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 17088 bytes
font_01_sfnt_off000128c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 16792 bytes
font_02_sfnt_off000140dc.bin
a3bce37f6226d26df4fdffdab7432f1412ae63d6f01d0701a2899132b052e207
pdf-font-stream PDF embedded font (sfnt) at offset 0x140DC 10444 bytes