Malicious PDF — malware analysis report

Static analysis result for SHA-256 b333db691763a6e6…

MALICIOUS

PDF

83.2 KB Created: 2021-08-10 02:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e0ba04a4836c746429494f356302588 SHA-1: 594ae6513c90efb1a729aae1cd957cec4b92436a SHA-256: b333db691763a6e6fa8351b2bf1d05f9e5fa1cacd8da1423981793610e62329b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to websites that appear to be hosted on compromised CMS platforms, specifically WordPress. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o8cuuv4tvbkvstcjbemsi7fijk/17135267687.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c7e02ac42c36ab90d0eb526e0bc4a67f/628453369.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099863e05795---foziwexota.pdf
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091202d3ca5c---rawazav.pdf
    • http://fluitec.fr/ressource/site-image/files/tajiwi.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/fugiweralifagogina.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/pozadejodogarereb.pdf
    • http://assistance.uz/images/shared/file/pazateliwovosatemokifis.pdf
    • http://jarosi.hu/files/file/59197567250.pdf
    • http://theurbanbazzaar.com/userfiles/file/99603821796.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae33aebde8---27561678085.pdf
    • http://fine-cottage.ru/userfiles/file/55663754002.pdf
    • http://askort.pl/Upload/file/66578376833.pdf
    • http://wisdomtours.net/upload/file/96089856488.pdf
    • http://hak-al.com/resimler/files/40185940291.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/6119429071.pdf
    • http://abbuffalowings.com/uploads/files/37362210810.pdf
    • http://popmetre.com/news/files/4978089823.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/80101615133.pdf
    • http://toshiteriyakiburien.com/uploads/files/65172402901.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bbe2613b724b1be073378587d8e5304f/593586593.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/jojifa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iq+test+questions+with+answers+pdf+in+tamil
    • 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_off0000e02d.bin
741128b623183a2beedd20eabfa41c16bc29dd34dea915f1bcb2e2f27eee210b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 11048 bytes
font_01_sfnt_off0000f97f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
font_02_sfnt_off00011191.bin
033f52964f1ef470eab7dbf71502f44e82b95d37fbb66af76addd35170e4e12a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 17204 bytes