Malicious PDF — malware analysis report

Static analysis result for SHA-256 3073da8b388e682e…

MALICIOUS

PDF

98.7 KB Created: 2021-07-20 18:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1207ccce13101b8cf55f1fd16cb3fb50 SHA-1: a2e08c48c2c413834c7646353d11a19bc0753acb SHA-256: 3073da8b388e682ed04acce1db8bd4ad844fe40dd3213eaa738b873862e1280a
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 numerous URLs, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.deco-interieure.com/userfiles/file/ropuxesulekajek.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/dudibewuxuwonexatuvazuj.pdf
    • http://gchs1969.com/clients/867877/File/fawifol.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0a75f0921b0b23306dc5caa8f178793f/25833525273.pdf
    • https://medosojewellery.com/userfiles/files/90143092451.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e1df8eb84484b5759aa7166a13ecf208/pifabomelisokubexunumu.pdf
    • http://okna-dvere-online.cz/media/upload/upload/file/lofelosivusa.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/telifawafiwa.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950f7deae06---sizazunimegabifumoz.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9ff7c204806efb4db824825042e34663/dodezuremesekuro.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8a53d7838e10514c62d58b9c95860f0/37338019686.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1dp1nugi4qgbuodktpegp5v6c7/41672119267.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ee2ee3ad71987756ad94834997eb6f3d/lalumomomikoriguwajolawi.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/762511d251ddb4b571ff9b382e0848ce/86624399786.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/83ac5dsm3brd0hsgmo49rfu6a8/vetamexorawojapusugit.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e8dc2df019d259c9dffabf516d484c0c/45499031993.pdf
    • https://anaksemut.com/contents//files/jarirolisi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de00f76086---99997547518.pdf
    • https://agentcctv.com/userfiles/file/kowazo.pdf
    • https://mastirz.com/userfiles/files/11968579012.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hnfft84k3ghsol7nt1pnk79hf3/xojab.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ecc0be8---36059923266.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=engineering+management+questions+and+answers
    • 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_off00011f6a.bin
68470947f2679a07f9a3cc1747ef4a5c2954a758989f8314bde3e56bd1a183c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 17384 bytes
font_01_sfnt_off00014cac.bin
f58a11f04c43c01738d9bab2d3713eb35c2d7c94ce162996ae658de4ca3f47ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAC 10860 bytes
font_02_sfnt_off0001654b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1654B 16792 bytes