Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1bf10ec1f01eef…

MALICIOUS

PDF

133.9 KB Created: 2021-07-06 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0c6414491d669bc1ab9da3215d38a7d SHA-1: d417d977cd903b350a7a9e61d902a859c24b2c4a SHA-256: 0e1bf10ec1f01eef779c0366dd53e65488ab53c8fe511f96d39231369bb5eb13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc59885e2271f5f5273b44943ae1be14/20781426101.pdf
    • https://meganimal.pt/site/upload/file/26291380453.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9f1ec9c260a97741d585fe0f5196b66e/xamivugive.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e76c71fc---pedelomozulamu.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7il4ktco6lrfo7du0jsbb6cu61/18039726389.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a765b43e29---ridufejaduwu.pdf
    • http://china-zub.ru/userfiles/file/zural.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/6bm3rr49ch6csnfm3k1b2spjkc/pozabamibegobafax.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9fbe9b8d66f54dcfe56c627b955535bd/77745813519.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fa65e486---vetikidet.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8891aef4---82516357618.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7a978b16df65bc421592a8a85899cff2/jarurewalulojojinadowe.pdf
    • https://argumentua.com/i/file/69995656094.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43f06e420---49827874615.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c4439725efff85a5bcbefeda5a4e66bb/fozasuvad.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3b31241fc57f2e6fb4d1bd260741d0b2/39229441539.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/uva393kerib30d1q0trbcrr1l5/lovizevu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc3314d8c---26904450895.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160852f6966a2f---95940576584.pdf
    • http://capesociety.ca/uploads/files/49432481628.pdf
    • https://robert-zauer.cz/userfiles/file/40509877275.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dfee3929916fbfc6bc8365965878162a/67798254176.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/399d70e799790ed44896b1ff857de151/70638197865.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16077563a0334d---legosuzejovuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=technical+analysis+using+multiple+timeframes+free+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_off0001a5e8.bin
cc52e1c7e3b24f977952aafa3b18b3c2c9b1c7af59e05219884417e1dc516055
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5E8 11124 bytes
font_01_sfnt_off0001bf76.bin
982885fd685e6aac9f4492cf3c90b8f447824954152d59cea73acbcf423bec1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF76 18728 bytes
font_02_sfnt_off0001f18e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F18E 16792 bytes