Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1690287b4996369…

MALICIOUS

PDF

81.7 KB Created: 2021-06-26 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 93c60ae5c1121ef66f5535e361f36a44 SHA-1: 3cd76340aa1cd26091d61b0b16946b6ef8ac4ff1 SHA-256: f1690287b4996369627eff9589311d1caf75d5ccc0d7936483c37bb6b3e7c00e
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The primary attack pattern observed is the use of a spearphishing attachment to lure users into clicking these links, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5544

Heuristics 5

  • 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
  • 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://berbun.com/user_img/file/sukipi.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/nezonuroji.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/7073152640.pdfIn PDF document text
    • https://maisonforville.be/documents/file/solidokomeri.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76894ce3d---72847349557.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6721673b---82875934403.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6fe021a9---zovaja.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b96615b76---72290555742.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eac483fe4---mubadudiwodi.pdfIn PDF document text
    • https://maturana.cl/upload/file/vivupamoxilivuwajet.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/db3de5bed39b8e5cf9c37283a71dedf5/80828410317.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ed25dceb4---doguvisizuvewitel.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210626_5B883552BEEEF467.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/528cba7f5fd7b3f0b1f6ada284aca258/15607821381.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bb03a4b7b296c23c9cf3cd3c6e10a7e9/loketogowowenog.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9ssm0gushr926hhqnrol07nvt9/33807613350.pdfIn PDF document text
    • http://absigorta.come/file/mupureborebakakafolulek.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/4723546612.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xuluboxixovov.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210614020323_9u8vhg.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/1671522972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+not+necessarilyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 17592 bytes
SHA-256: efb76e157add2f21de6bf06092f8fad6cc9d91e8ba7725be863e70c236501075
font_01_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.