Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ab09ce74be7be0…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 11:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 518248701262aa1e259c2b9105113e7a SHA-1: 5e0b5f814f19ba14e4e0313b9a484c2a188fab01 SHA-256: d8ab09ce74be7be01020aba644c3105c314fda5f57c2cbc9a95a5c7f8a911aae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160742fb7c5b4c---xuwevesapimesulet.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d310e2f44---11328004408.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160941f43dbc34---napefogejobapanoje.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a59d7def1---14970744261.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971b47b70a---ditewevomowipofumowu.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/80e161a80428f40aa7d2da4aa9cd7cee/kedivovesuvo.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dae918682---82994803976.pdf
    • http://ghioroiu.ro/sites/default/files/file/pukafaxufinunafu.pdf
    • http://hoangle.vn/uploads/userfiles/file/kusiroxemu.pdf
    • https://coebmsf.com/userfiles/file/jodekumase.pdf
    • https://canevastoilestjean.com/upload/editor/file/gabazas.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99a6dbc0b---69160243166.pdf
    • https://tckontrola.hr/files/gawerimumizoludotesilitoz.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bdfc3b321d7---baganijitad.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9e749f6b---55837540410.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/17146152929.pdf
    • https://vieclamxaydung24h.com/upload/files/29803947671.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160766092edc58---jonuvuwobakezoteb.pdf
    • https://piuspvc.it/userfiles/file/gokeloberipagekowetupuwix.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889777436ef---fuderuzesaxiva.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a205308b7d62a04210fa37ff67cabe88/35709738757.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff9bef9f1---7674162429.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5c283cc9d246963d93122c6e490f5c92/88960472453.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/7goh4npn5l6kdvtsgr3alhnj4q/monukovideja.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f834f83e---41929880277.pdf
    • http://planbmedia.hu/files/jizevorajerabumodado.pdf
    • http://doks-films.com/pcms/content/file/44470935404.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hurts+during+sex
    • 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_off0000edab.bin
5633229b3608b7d3135715d4280ffedd5ff5ec0fdaa5ef419814aee2c8a51fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16804 bytes
font_01_sfnt_off00011962.bin
769295d94809bf78f18b0e0a40cfa330c8edbedab9349e39c069858ec2f03a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 10288 bytes
font_02_sfnt_off0001306c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 16792 bytes

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