Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22aa987c4b40636…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5647572fef6215153b0c39e60ff27be SHA-1: 7375a306657785b29a939839e574da43e11b0afa SHA-256: d22aa987c4b40636fc57ee64bd301117960b78eefa099e82bc5ea56cc56d32da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic and a high ML classifier score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and linked URLs strongly suggest it is designed to trick users into downloading further malicious content, likely a Trojan as indicated by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=image+viewer+for+windows+10+64+bit
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4c87fd0d3fef79b8466b94d8542d844e/worikenumibusiremalumufa.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/14aebc2b836d0103e0ebac2bd7dbc991/48666384480.pdf
    • http://morgancountyoh.com/userimages/tisovavibagonedudomezux.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/66ebf33395cb23c8939d04f2c13e0cc8/82326022943.pdf
    • http://cec-intl.ru/app/webroot/files/file/52905978546.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/vepoxunivisuperexezuba.pdf
    • https://invest.pl/userfiles/file/fewakulu.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/315c20f6993670682605d2ad10c10194/38604078637.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ec7c8e17---gewanuj.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073763587829---11190508674.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb851f4907b---21649456393.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c967935e36a---tobotaromaseleno.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6d76e91348bb78cf6fa3c1917034b42a/36754699124.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ef8d9b36---1750814058.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6a64713cb317ef50e71540e53c6af832/87210694225.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7cd6f99f---vofokekesevivalufosujod.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/maedl0tvthr5254pf4fcnuavu1/vexujiwofokizudofazi.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3b3748707431ccb8ad2bd762461c27c/67271740735.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66c2465b7---40710785990.pdf
    • http://renovator.cz/files/file/88669631194.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591ed8a8c9---teneda.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3f1ef6a1838d46a3463aac9176d6d4b6/lusobomizexusuliw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 16792 bytes
font_01_sfnt_off00010127.bin
51788fd6c6421ee35023b5dc42a1f8b4fd360b106a242a7472beed3bf391551a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11316 bytes
font_02_sfnt_off00011bac.bin
15510956be7ead9f824e209a6104b8be563ded270a313a9f6e525002084f8b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 16252 bytes
font_03_sfnt_off0001318f.bin
f41f77833d584087574bb3d52f9be6046ce615ce7ef96d01aa77fb89b60e078c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 17132 bytes

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