Malicious PDF — malware analysis report

Static analysis result for SHA-256 317c1cb27c631878…

MALICIOUS

PDF

104.4 KB Created: 2021-06-27 16:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ac05c27185ab578eb1e2a8664d59d04 SHA-1: 8c8b609a7a4c193162147170942b36f68bf62f78 SHA-256: 317c1cb27c631878a965725535e1b8bd1b0278ff6bb2436acc207ecb633c70fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/185s6lp9cnauk0vmkuvif80mbv/32611935478.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/zejiwevabiped.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/74009fc62d7fc4f864db8766ab825bd2/gisaja.pdf
    • https://aimhc.com/userfiles/file/45066157767.pdf
    • http://akicgiyim.com/userfiles/file/webenejugeteb.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac061917d0e---zowokevaneb.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16097ad12685d6---zevozimuputikewojirefa.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2jqkrs6uk6cdogjp2hrjcde6sk/19574181972.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rbgp7c4krpaifo7kpaj33e502v/guwosaso.pdf
    • https://turismoporsantander.com/aym_image/files/17324801368.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fnq5q4b3vnbqe9me0cl0ltqnst/67224514862.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/66a9d8b5935da12541e22be28a97bb4f/79296985250.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074188cab8cd---28961167481.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82fc0744e---76309486409.pdf
    • http://sys-svinding.dk/userfiles/file/xesalirim.pdf
    • http://luberoff.com/userfiles/file/gomigoju.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/42e99c123bda5dfe92d264c3ad739d44/gevusiriwovegikoz.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a0010b01---misiz.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/86bcac67074d19bf717727b857055a1b/74288209787.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/776f425875560ca397858aef2fe54448/73738070451.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5ce2c1b8483e6539aef205c7062f44d3/9600925116.pdf
    • https://bluza-shop.ru/content/File/lexodamapipi.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6bdba749---18610670847.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/29713838031.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=coo+what+does+it+stand+for
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes
font_01_sfnt_off000141b4.bin
83d8b69042e51bc20ff8f2b5d6fa789650ded0a96709c4f9a3a2a9fd205348ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 1660 bytes
font_02_sfnt_off0001499e.bin
abf7baecc48288ef05acc9af6b487b9629f4a66ce37d7808caa61a77fcf8b938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1499E 10520 bytes
font_03_sfnt_off000161a6.bin
4cfd54bc39162d81a001217319de55aa5ac91a1e93f11a1bce65d6359763bc9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161A6 19216 bytes

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