Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf4c0a1f76a450f…

MALICIOUS

PDF

109.2 KB Created: 2021-07-06 19:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 143babfc702170f2b8141bc0b1ed71e6 SHA-1: 474cdaf9da43de0e391cc9e154d49e1971611996 SHA-256: cbf4c0a1f76a450fdde550fb79cd3515f9c2484a3cd82da4b50768423acfe301
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd87b9753---likoses.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aec152851---vibemidefegosujo.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/jotokirunogegusolo.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u5uf2sm9ubphlp69vesrlqein5/48397750412.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6853bca88---68620867781.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/43215055415.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e74d56ea3334088cd8f67d5e1cfb6757/7144322018.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91a5b63c8---pugobewozibixukemewadi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e05cc5032---20448440167.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c40f549b79f---20531550319.pdf
    • http://architects-desk.com/uploadsfile/mufexalipa.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8b20aac099cdd2d516828e9b9fdb8351/rezabomekarozowapuledudaw.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/65f1383a94fd41eba92dca4f7b4412eb/24219788139.pdf
    • http://t-p-fortune.com/userfiles/file/tusukepibisasukukopo.pdf
    • https://alteanetworks.fr/img/file/gamafelonokajor.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e932eeda---44281107427.pdf
    • https://tenfci.org/userfiles/file/54418470370.pdf
    • http://akinmedikal.com/uploads/file/kajinotonugozup.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/a9rb441ga24og8qf7bfh9bt5gd/pojuroba.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/75vu6jppq26uucbt27d3okblj3/xewesutefazu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2959472a---ruzedeluvubezunobu.pdf
    • http://e-sportis.com/images/upload/56304001427.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609258140e026---78601562335.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cambridge+english+books+for+beginners+pdf
    • 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_off000142e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142E8 16792 bytes
font_01_sfnt_off00015afa.bin
154faf8ea6109265bdbb8c6eeb0aa5546d23ac3f149da3b2ca02580aa3e1af45
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFA 20176 bytes
font_02_sfnt_off00018e2a.bin
09a7ef449979bfdc0b612a5484e392a4f5887e2e184fa5b6639f6ec6403e9486
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E2A 11108 bytes