Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bf2f04c250fcf2…

MALICIOUS

PDF

92.8 KB Created: 2021-08-18 15:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34c784c946a979fc921766b091c7a86c SHA-1: 673511b95749a1b46f98945f54cb683d37507ab1 SHA-256: d4bf2f04c250fcf2cbf60d724f95e39ed60f23f05d23a25162dcc10f193ae9f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c0e78e1e---19894402235.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7404269aea1ab88070957ddbdbd3564/32258981290.pdf
    • https://vsetinrally.cz/userfiles/file/5483379435.pdf
    • http://cancercareresearch.com/userfiles/file/33933821077.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4mrf2lpo626b8qau0ljtj9soc4/53770354791.pdf
    • http://provia-events.de/pics/fotos/1/file/42589039142.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d3bd9d7f---pumotosudagiboniwejoxuse.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c24769719---73186072751.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f540d1df5---wemejagulamigula.pdf
    • http://imaginove.eu/data/Files/98127869608.pdf
    • http://apsara.ru/userfiles/file/51123248718.pdf
    • https://techson-cctv.com/upload/file/jilagovibaxuzuliwiwerap.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/80704617175.pdf
    • http://bet-balance.com/userfiles/file/57137291254.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qipfmba9rqfqcmrlpvcvvhid82/70966112335.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d468acffa1---bukito.pdf
    • https://autoteam.in/ckfinder/userfiles/files/nepofiki.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/wodolumufivizofediliz.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e03a5b5513a97138322fe29615215c74/25310341969.pdf
    • https://charterboatdeliverance.com/uploads/files/xuzesufonuvepatazedexidu.pdf
    • https://phunhai.net/upload/files/18525518458.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fbf553ff05b0dcab423e0f75a5adf419/jaxepibenake.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/94013545350.pdf
    • https://www.rebornevo.com/fo
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+rejuvenation+relationship+guide
    • 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_off0000cdad.bin
a40fcf1962cbbd6099ca90ac89b406775165af3742465560bfb45b3e15e4c675
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 11228 bytes
font_01_sfnt_off0000e795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 16792 bytes
font_02_sfnt_off0000ffa7.bin
ff2522572648865cb70c3108cdbd3bbbc9df55345163e1b9905e402e3cfc5f96
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 17068 bytes
font_03_sfnt_off00012c18.bin
d1db82886108c97e589ca61d4e5db8159ff8cc27c0ca47c026760531b6fc7554
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 18320 bytes