Malicious PDF — malware analysis report

Static analysis result for SHA-256 542a01031c3d1a67…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 04:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fda78c00e7c217e206038201a13299b9 SHA-1: 0eba4a6f75c822c86fdb75f80023b2ea637d3dd2 SHA-256: 542a01031c3d1a671e34878dc0f91a4339f8cbface39fe38d57e35af4cbb763f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tibiro.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73dd7c662---62505435567.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c91c93b63e7dd514fabfe3dee8dd4d6/90914604284.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/p7tnp8mktei5j0h4e61thhg3tj/39610539093.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e82f48a92dc445b2949aa1724539c8d8/49540395827.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/62c0875b1ffc12c4e075571dec89873e/judevotofumodixu.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90ff160f2---konejabujovuz.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a6e695b5a---89012476215.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7767ef693---13336725016.pdf
    • https://beautyyaurient.com/editor_upload/file/wowiposewosevowetijudon.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/609583d4a8ab8cca82919ab92da0533c/72410413751.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0684e030c4c6f2190a497c0d6777a3b6/25673941068.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c734e6e576d---45575674991.pdf
    • http://vce34.ru/attachments/file/31237796750.pdf
    • http://skupka23.ru/upload/m/53637216058.pdf
    • https://daaeportrett.no/upload/file/muzesojupigatefum.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b58c45a2---wewibotulolo.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b09f955cd---wuduk.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8e26812a---nizogid.pdf
    • http://barcabianca.eu/upload/file/47610444021.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c85dd4ca9e3---vajab.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076319a74297---17755879506.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/824b0eab1e0fbf87319dcf09834df588/64757045384.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/754a7841456a510bda06d4d829bb4fd5/66685856476.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/9578342877.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7c8a4668ad6356cbd8b9ec8e098151c4/rugetesowizupanebal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=exercise+for+mind+power
    • 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_off0000f6eb.bin
dc612dc231a94d216f68c5113bce1a07f40303b64da16ec2218f2359fea76bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10648 bytes
font_01_sfnt_off00010f51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16792 bytes
font_02_sfnt_off00012763.bin
bc1a624fbe4635013f418e1d1d8572aa8ff9f9857f5513302121a2a6b5574448
pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16928 bytes