Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e0eb75f7bd9f67…

MALICIOUS

PDF

104.9 KB Created: 2021-09-02 17:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e4a6024d68a1ff9daf1e4c7ba528b6c SHA-1: a3a5244899468a3283bd5a3a8ebec25c1240e82b SHA-256: 31e0eb75f7bd9f671c1a03fea34bf872c962644140615c22019a3d45911b0a87
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document is designed to trick the user into executing arbitrary commands, likely to download and run a secondary payload. Numerous URLs are present, many pointing to disposable hosting or compromised CMS uploads, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://medvor.ru/uplcv?utm_term=drager+savina+service+manual+pdf PDF link annotation
    • http://samuiluxurytravel.com/Uploads/file/romefeguwitukuwow.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/67430250078.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/ketadafewilirebezela.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/defuvimajitejowu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bba0335f86baf6997d7740929f1e5a89/18489509373.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/37255144439.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/vumirovi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c967f2f4---mirede.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/73296787592.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/jokefusola.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/76772191390.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/6801860337.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/miginusar.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/zabusorexamubuda.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lonibamekizedim.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/90257046800.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/34913337115.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/219227be006d50906f75a854b6cff9f6/44653815871.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/lubumiwofeworijeruso.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/71984377926.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210702200230_rowim1.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/14919605496.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 10912 bytes
SHA-256: 91a20ce9ae46f4dc475e92be6393810a5f3462133eecf7cefe43dcf783698126
font_02_sfnt_off0001600a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600A 20516 bytes
SHA-256: f168cc32e9a0a4429131bf1461da9d3c5e1cb0dbcd76e6e2400c4eadd2a0135b

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