Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc81fa0f72d2a74…

MALICIOUS

PDF

92.5 KB Created: 2021-06-28 00:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c714f8013c15c9c6a9016198a0af653b SHA-1: 6e591955090cc239c823cd873c0d82126c21b478 SHA-256: fbc81fa0f72d2a7467e5127d7264ca7486669937cb0f71a9c15c6fa8ada015da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/j20h0moee83q67enpj62518cdp/21073523382.pdf
    • http://kleiberit.ru/files/file/zifodezid.pdf
    • https://strategieb2b.com/userfiles/file/26415736045.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/flhddr58pqd581g8ktb1s6jeo1/dovawunowupoxekulomi.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/upur65hrocfnqphkopn49alho4/47018889035.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb80fb1c6d---zudegapozudon.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5b58c7d0---refawanabodo.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/41791782850.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c282b1a490---kaxisabegat.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0d047f3ec69f1e8bbe53eb0cd464d368/79570130012.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd432d66bed---zukomakadarolesetusin.pdf
    • https://sasalidayanisma.org/uploads/file/tikedezelota.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/54d3cca3c057b5cde111e379fc87beae/mefuxaletozenu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd77409366---23237425947.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62350175f---48899446223.pdf
    • http://carrozzeriabosini.net/userfiles/files/70995677549.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/476f1025d85d126a20f42c22986bdd54/tudawidiwapugowonajuza.pdf
    • http://whalesart.com/uploadfile/file///2021061122302064.pdf
    • https://haidangpc.com/contents/files/88856093962.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34493735c---97024981385.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/570d272e49ec9c8ee7e36d82320fb058/64688356588.pdf
    • http://katyababash.com/images/uploads/file/22275789683.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8c852f95295547b8f1b51ec4808a7bd9/43763252781.pdf
    • http://alliance-ltd.com/userfiles/viwigejikalagusimulotomen.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c836db0e265447acedb28ed6fa50d9dc/vujibalunozurupizakakin.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b331136647---javoragekuza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=san+andreas+state+police+logo
    • 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_off000103ce.bin
fd465dd5bc8fc40bd47e2bac71eb5974c19b866fc67507598d42480e5def5c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 10764 bytes
font_01_sfnt_off00011c6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 16792 bytes
font_02_sfnt_off00013481.bin
5b0adb9c69f135c3ae73dcc9e44eb58889eb381e2ba8b760f6e5f8bfc8e4b5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 17712 bytes

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