Malicious PDF — malware analysis report

Static analysis result for SHA-256 21935266e52834b1…

MALICIOUS

PDF

85.5 KB Created: 2021-08-17 03:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be6c45d9430c439fd7cf87e753e7fee0 SHA-1: 9b9ef9b0ca53e9d251e8afaf804c2910991481b4 SHA-256: 21935266e52834b1dce36c9bec579604cde96f669424609ff05b337e4b214b77
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=money+and+lp+cheats+for+sims+freeplay
    • https://briljant-maleri.se/UserFiles/files/88663670166.pdf
    • http://showpalmedical.com/userfiles/fovidaw.pdf
    • https://mokhalasati.com/userfiles/files/tutejewigepugorel.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/lipesoliredizazijebo.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o8ehfrkvnbj6j250qj1j61pdcs/govizivuru.pdf
    • https://shop-ecobati.com/medias/upload/files/rafalerajedul.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdaaa30eb17---wulafutajuri.pdf
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b115d338f95945ec0259c9436972070/66463046291.pdf
    • https://angkortaxiservice.com/userfiles/file/46137432555.pdf
    • http://chiengthai.com/file_media/file_image/file/77495461543.pdf
    • http://cuacuonductudong.com/upload/files/xadarip.pdf
    • https://10glazsikeyrosa.ru/file/57726455257.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2f3ee0cf5eaf515cc5b408aa4a87849c/mikewikojabagure.pdf
    • https://balaji-technology.com/userfiles/file/nuxovagefaje.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/43211899670.pdf
    • https://yesilkoyluleriz.biz/resimler/files/ruxewu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59e0a7020---zafowapupasusasumodugele.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/233749b3442f8255f20db7d7a6b5ae58/wijupum.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202152695308498.pdf
    • http://orderleesushi.com/uploads/files/97684337491.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pl8gualu447pl9bbbsk9sii6bj/resavigevewuseripotukuna.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8fe3bdf07d9979f1fcf3c1fcb6dc55f0/98592543297.pdf
    • http://mamaskitchenorder.com/uploads/files/20133825822.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ede633346e7ae9b509b69269def842b6/58054027451.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin
b3a9f2edba3e21fc34df6bde500a4973b5010114aced390ff3bc5c54f81ad822
pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 10992 bytes
font_01_sfnt_off0000feec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16792 bytes
font_02_sfnt_off000116fe.bin
2a7697805c696f10bc20607b14a31e9c2281a1002fc01ef28f510fcd230e6e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 18976 bytes