Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0878eb3b791b2a3…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 16:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e560d1c0602d676136a4963fb2254bf3 SHA-1: 1ec9015c1114f70186dfa38691c744ca12fbb0c7 SHA-256: a0878eb3b791b2a3a01d20cc248b43c52eec89b388387bd1725c46040b816fc5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's designed to deceive users. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cpsguffanti.com/uploads/file/fosegurusiko.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607df03f9a9c5---legugitedonogigof.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965996f20d7---12388779160.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6b797b95095d4c013f289148960e9a24/joregolowuzakeredate.pdf
    • http://berbun.com/user_img/file/59420413342.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0482bb24592f36a38860dd75d581638e/fapoguzireboxorejubadumug.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f12003fef---83561550453.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5kl5bgk0s10b8trg1h1v3tbflf/75155819846.pdf
    • http://remaining-mc.de/userfiles/file/4631443528.pdf
    • https://panificiopasticceriabattaglia.it/file/87746031187.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ee25fbdc---94539535723.pdf
    • http://osc-pribor.ru/products_pictures/file/japonikivimanuga.pdf
    • http://matstravel.ru/userfiles/file/bukuliralatekup.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0fc7050fb3ca7125b698362a6632f147/fejume.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/faromowumuxunokulapu.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/31477128255.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c34b674d---fuzafe.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d0bbdc9ce792bd3c8308382df7a1f4ba/tuzuferivelazawujopidu.pdf
    • http://beijinghuojia.cn/userfiles/file/welidisixugezizewuki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+titanium+forge+in+terraria
    • 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_off0000f540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 16792 bytes
font_01_sfnt_off00010d52.bin
b35ed859ee1e5a37a8c7eabd4e0dca7950dfa9f4484f8981d82de1368cce431f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 17500 bytes
font_02_sfnt_off00013b1d.bin
eae8edf7afdae463d38068801675ae53dff168028b0431cbd3286f90d968460d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 10612 bytes