Malicious PDF — malware analysis report

Static analysis result for SHA-256 977b678e73815123…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 12:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7932c46f258082a4f19a9fb87b06814a SHA-1: 861acd9a48f7296eb2ee724b7bd0e771ca3fad53 SHA-256: 977b678e73815123b302e99f153e54293928eedfbc55cc628daf8b6a29a9e80e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URLs are sufficient to infer a malicious link-farming attack pattern.

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5139ba647f---resoberox.pdf
    • http://vantaibactrungnam.vn/upload/files/75317905192.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160945e9eec6ea---xoxetofowa.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aeede38971e---75654598861.pdf
    • http://aarogyamedico.com/userfiles/file/3346863610.pdf
    • http://www.toptehnik.si/images/26346824485.pdf
    • http://ccforum.kr/uploads/file/1622804886.pdf
    • https://aashianarealty.com/file/36694404234.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e86063298bd13b23f69818cb64184cef/lizekulededesepagutobef.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd82c98a1a---28639082358.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/48111213138.pdf
    • http://veraschwemmle.de/fckdata/file/72076209962.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789c1da7f4b---73567281491.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2425d224e5---tulatutanuposujigis.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc6975af9abdf42eb6b0cbbff7fa52c7/99975939103.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b293421f75e---texupaxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=disrupt+an+industry
    • 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_off0000e31e.bin
69eb1165416907e8dbb32a82537410977ecc333f256d66070ed75d520c5dd04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10300 bytes
font_01_sfnt_off0000fa70.bin
a06910e0ffa4866ac8d7963c201929a30bc851ef7df8bd48ede3433cf7ff4b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 17436 bytes
font_02_sfnt_off00012822.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 16792 bytes

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