Malicious PDF — malware analysis report

Static analysis result for SHA-256 667ce4e516f99180…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 19:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74c02901195f81cce7d5337728bb50f0 SHA-1: 958e25cd82631c8b0d6ca2846f0337bc7302652a SHA-256: 667ce4e516f99180548a61763a8c1fafd90abfb0ed5aaf4fe820d8c0404c9d54
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics and the compromised CMS upload link farm rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://communeouchamps.fr/userfiles/file/42878287015.pdf
    • http://rauvuonsach.com/images/uploads/files/34328604718.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ha8ref49mhb31fv996imlv61n4/47095550830.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03d53de35---51386100618.pdf
    • https://bawwabatrizq.com/userfiles/file/72821160838.pdf
    • http://aostavet.it/userfiles/files/dukebuzoro.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc041d1b2d3---26642396591.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/62140205379.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/nptpukcn3r1f2dar26eftk0ke1/6673879064.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/1697073.pdf
    • http://accronline.com/userfiles/file/12678146065.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/timuxudepazusabizidoxiz.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966b5e46bd7---4912417862.pdf
    • http://mai-colle.jp/userfiles/file/37457637255.pdf
    • https://tonitomov.com/picture/file/gakivivapipozi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61aa6dcc7---kunugiwuzebatotidu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2cd3edc6dcaeb96a3d3cb4af99bb7f93/sunasixumesafirifogil.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20216394478123.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8ab0182---gudomofifa.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b095ba47122---45094190621.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2tji3g2g5kietai7brbvpc6m12/92174306581.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bamboo+structure+design
    • 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_off0000e6aa.bin
bc5e99d9d0419f64404c8e3e5c15cdc9f747f67b049e93c1f8a0edd728fa0b84
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 10960 bytes
font_01_sfnt_off0000ffec.bin
a92d7c9e0829981a89e3ede8194a13b9d7c55ec34098524eaca816538b0be123
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16532 bytes
font_02_sfnt_off00012af2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes