Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcbd5f040b50ae1…

MALICIOUS

PDF

95.3 KB Created: 2021-09-06 14:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1060682a35e44d6185fe913575bc8eed SHA-1: 12e90db3c3e0288f2140490331c06fd8aac1c1e1 SHA-256: edcbd5f040b50ae1c0f7accf306a1370b2aabaa97682039590ddc81b60ea05df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The numerous external URLs embedded within the document, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://coretry.ru/uplcv?utm_term=gamefowl+bloodlines+list+pdf
    • http://denki-shonan.com/uploadsfile/3972929472.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/98708690497.pdf
    • http://alphasigmaoverseas.com/userfiles/file/79597331796.pdf
    • http://selidbe-beograd.info/files/xilewuwefobobaj.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/eb1ccf64c5f5e3ccc68cbd5ec2091acd/36583376056.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/p6lneqnu32s84sukstus2kbpdb/33572617442.pdf
    • https://pmms-online.com/assets/file/76816054478.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/46ecf6395de8f6772528d1621191bb07/silewuge.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/72848762877.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1de37ecbaef9251bb3eea1bdd3b2d905/95817286226.pdf
    • http://tythb.cn/uploadfile/files/gukolibamozez.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e03e3505b---10351634672.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c4a55ed8bc2120fcbaa4b8ca6eee2203/renitanewadufodeb.pdf
    • https://fentesmakina.com/paket/upload/files/zigera.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e12be3f051f---84069560297.pdf
    • https://parvazyab.com/basefile/api203/files/34853932737.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/mitezex.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/pixixe.pdf
    • http://dlzj.net/upload/files/20210604064313716984.pdf
    • http://farmina.ru/uploads/files/jirawamobumodapusololijez.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9950954bb---32673754438.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608235302dbe7---36656412500.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6789410e---pirerabezuwaxokebagijobob.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160e8538cdaaf9---kigidamizazigowugamevil.pdf
    • http://architettotamborra.eu/userfiles/files/53581639283.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ed67d90bf67---bogate.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_off00011161.bin
c9d92957c7a79bb1ef863c690d582feb69a80cfaf954b6a8ac4a2472d32eb679
pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 10824 bytes
font_01_sfnt_off00012a2d.bin
a36edb159e4c8e6cbc9eae24c56f3e5f0379faa81fedbc9ecd970ff967aed309
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 17628 bytes
font_02_sfnt_off000157c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x157C4 16792 bytes