Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52cb93ccf8202cf…

MALICIOUS

PDF

95.3 KB Created: 2021-06-26 21:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 938c9f5442c2828d6c0ccf7a89e3ea81 SHA-1: f2ef59a4a910d467eb8a692008ee9851a38dd6f3 SHA-256: a52cb93ccf8202cfd2b8cf2ec7e58a2919ca14aebbb8b1b5bcf5e9ef9a359fc8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://beerskiboot.de/img/upload/file/94179546490.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b275a495d15---81709471463.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d418aa7a3---64584763796.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbd8697c3---69890569520.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096698313182---vapixuzugazotetepij.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3b71777e---25778450585.pdf
    • http://dianacb.cz/userfiles/file/76231109944.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/lukudesifasugewuwofilupi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f4aa3b5c---47984129948.pdf
    • https://zaragozadenoche.es/upload/files/73076358116.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/dimozirenegikotulazura.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/49569959351.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b7f12887c726d3e96eed1a44031c0a2e/53481628235.pdf
    • https://aprilboya.com/userfiles/file/luzegofovufideni.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/11fb440ef3e1fc4d1b55e50d575637b0/15850266855.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/06cf6e13104e1c8be4d4c791f9deb758/33710425218.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b91fd0f972d29785a52502aaf52ec1fe/bokubetosesixedexer.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083a91e93fe4---najimagajilafoxopar.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1701071fcdc39b62da6cd35846bdd73/13911482843.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609467ae44b4e---74959805409.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/64e55405f44c1790ad9f107655724e0e/ruwasajewenodu.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d6c815c5d7223fbfcba9af06361daba5/58841262743.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aff37a26---14793307022.pdf
    • http://alpha-th.com/userfiles/file/4023756768.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=example+of+single+user+single+task+operating+system
    • 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_off00010d54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
font_01_sfnt_off00012566.bin
f42fa8dad7682e3bff02773a64e3d7c5cffa9ef16850eb230fa981395651dddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 18180 bytes
font_02_sfnt_off00015592.bin
a19167e445217562c129cffb2c4eb1ef554c1cd9a85898839ead3182475642a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 11092 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.