Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cda47e88ffcc616…

MALICIOUS

PDF

113.1 KB Created: 2021-07-18 19:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95d7dcb138426b681024d5185e112c6c SHA-1: 518e6b2d46ceeff610071882e00accd5684463b7 SHA-256: 4cda47e88ffcc616d1a77b557a2d6a4ad7d8fec9046d0a94eeda5c01cf2c4258
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm, including links to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://kuzfarm.ru/images/file/76272063562.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfea76698---xisudiriwutil.pdf
    • https://an-professional.ru/img/files/file/1908706928.pdf
    • http://korvet-sp.ru/userfiles/file/7911690131.pdf
    • https://siahotel.com/userfiles/files/tekimoverepud.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/fanatibivopa.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/bawadigiboxonanujufak.pdf
    • http://skiflogistics.ru/userfiles/file/49743299659.pdf
    • http://kaitosushisb.com/uploads/files/lazawatewufemokexodub.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4de842d76---fomoputatutupa.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8eb8c7bc---lelarixanepepoga.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/wikegofulunal.pdf
    • http://aarogyamedico.com/userfiles/file/62636533782.pdf
    • https://sanruouvang.net/images/uploaded/file/147110277.pdf
    • http://tofuyatogo.com/uploads/files/76026652226.pdf
    • http://cana.vn/uploads/userfiles/file/28982866460.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/77f4cd280d2e0173a4d51993f8832ca5/xululi.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ae8d64639rpq187r4d6fmd4r9t/giziputewunowexukoretu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785384092f8---17402190897.pdf
    • http://gtshotel.it/images/file/27839068423.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/bumokezuruwefokajewi.pdf
    • http://954move.com/clients/4890/File/7120698201.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180b3e7c3e---98871505058.pdf
    • http://huerural.com/uploads/image/files/gexekizokoxomilisi.pdf
    • http://aj-logistics.com/stock/userfiles/file/85439460931.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eb5325c07---5024102570.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apa+6th+edition+citing+a+website
    • 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_off0001546b.bin
f8f8a252cbbe170fd66adf8a30543049575853f400f7298d955713a9119c0f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1546B 18748 bytes
font_01_sfnt_off00018543.bin
69ce1a20e1d6be988ae86d03005984b1fe36231d4df01885380e920793b7b4d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x18543 11024 bytes
font_02_sfnt_off00019e98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E98 16792 bytes