Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edc473218bf5f83…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 04:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db94bedef7a3f9480fcb6570e3fb24ae SHA-1: 76af7dc501ed005a0f450b6633550a028419a8b4 SHA-256: 6edc473218bf5f830e600f0bf409226451c8d1ca5f7ef179fe7c92d989d8b4b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true malicious destinations by using a large number of disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://southwestlooms.com/admin/userfiles/files/botijuzakorajarifutub.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5aefc2d9c---30730788915.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a7da5e3d32649b024b99aa8e5766f692/munixojininoz.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ad4e30fe9cc51adc40b20e096fca55f1/49963758663.pdf
    • https://burstallconrad.com/editor_files/file/femaxilikituvixafuz.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106280331582762.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251bd7ca32---64645591027.pdf
    • https://kocarbon.vn/luutru/files/vubejupenaxoragid.pdf
    • http://deauville.ru/files/file/ridubesalisiwadigogo.pdf
    • http://longthinhphat.net/uploads/files/dinev.pdf
    • http://bienbao.net/uploads/files/favarimo.pdf
    • https://aprilboya.com/userfiles/file/84054573630.pdf
    • http://muszempilla.com/files/file/rulefebawalubapifikel.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b11f52def409b7d9420091a2b5d3deed/tolepolibodemedoto.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/047a65a6a9dcd6fae09553f50c5147f7/63017889809.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e0ece0c7---90948527075.pdf
    • http://altinay-law.com/images/file/nafavi.pdf
    • https://prtl.pl/userfiles/file/kujiwufizuwikadusigesepal.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jizupenipuvobixedalamig.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b2c44442---52635979445.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b3e886610e7aa0cbc4f3d05b9e90fa/93833449204.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b89914b0---vexexo.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a71fa48743a7e43e45b90bc62eb3b8d/rudivitojujut.pdf
    • http://hydrem.ru/images/file/vategojojimedorabuwepa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=find+the+equation+of+the+curve
    • 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_off0000d500.bin
94da071d87cd7ee37ee961f4999d5c8ba7ea74871ed8c8102e48280920c52ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 1780 bytes
font_01_sfnt_off0000dd63.bin
3a9cb221d1c5a36ad6614f1f51bcdbedb2a5ea790f8f514fc31b52b5033ad3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 20416 bytes
font_02_sfnt_off00011328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 16792 bytes
font_03_sfnt_off00012b3f.bin
9611a2ab75a0734378f264431771d95cf4035fb9909e5ea5f238dedc90102939
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 10648 bytes