Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d36e83ef8b5433e…

MALICIOUS

PDF

101.7 KB Created: 2021-07-14 01:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6eee08f38d2bbe82425647583135593f SHA-1: 5b1d991d44d60ce052403a8b10d1542e5074d3b2 SHA-256: 3d36e83ef8b5433e31a550a72fa61a21bfb95e3e43cf510712f9048b4d1605ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are likely used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8d43261568606c63399798d2d3a0e348/rogetibogilo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b0ec4137bf646069a08ecac2f9c296c3/gerimiluxexeduvanozox.pdf
    • http://abwessex.com/uploads/files/77694743843.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767449001c1---begavatoxaxusuraposipodog.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/gukonadenurerotipe.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bdb1616e0a4fcef41dd7b5885d16fbd6/wumadefokum.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/60570094605.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609633e5cf433---12055428752.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/45b1fccea630caa69a594079fd789e4b/74748408317.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd58d1c71c---86303971440.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/79bbaad1e15a691d7112a60c53fb72e5/2336076145.pdf
    • https://zzhqhi.com/d/files/rakewarid.pdf
    • http://murphysbeads.com/clients/54316/File/zomexugezomiwiwavuburaro.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uikk27m2fgb3rdmnfjfqfrd0ha/tuwurawonufisuxilalawo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54f29b86c---kirar.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7hoijct5cbk3ceu0g4tjis704c/63996984638.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/74930dc62f7615a79d995bfcc79002e9/digeg.pdf
    • https://himalayanthailand.com/image/upload/File/xugon.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c36cc1e61fb7512d81a11c41e75583c/wivut.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7biqancak0ec3f6tvss4pgppvi/14781635669.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=english+meaning+of+ancestors
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0fc28960---75680129475.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011042.bin
ab08583effe2bfefabfcf2f4d5e579bcd4e6e952c95d47216f528245eb088adc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11042 18808 bytes
font_00_sfnt_off0000e941.bin
46ad99870facf7c1c7c9ccae038743c58694391e90adadfe68b479b844c4c753		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 3796 bytes
font_01_sfnt_off0000f7bb.bin
038c3704e276db0cb458f2b8baf3fdf4fd6d416ae628d7f79ec3789c144bd22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10764 bytes
font_03_sfnt_off00012f0e.bin
7ff4ab8a16f47a184eb3074bccf835ee5d9dda17857b41900acc1854d1d48809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 27452 bytes
font_04_sfnt_off000170e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170E9 16792 bytes

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