Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76745d2fbf57b59…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 22:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ba54431ef4485f736cc47cb7c1dea1d SHA-1: 524e93191c300ba7931b87ce34ff2bd6f10d1ad0 SHA-256: c76745d2fbf57b59cbd741e0e2d5fbe68a5f99943600b3559b917928faaddf4c
164 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 a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various websites, some hosted on compromised CMS upload storage and disposable domains. The presence of a 'download' button lure further suggests an attempt to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/mezofilasonev.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bce47db1c---92585275940.pdfIn PDF document text
    • http://3sdent.com/upload/files/kababubibaxefadapumufal.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73b0a873c---wofipigotafira.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/92604900401.pdfIn PDF document text
    • http://hotstamping.pl/files/file/7188394339.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/96217842665.pdfIn PDF document text
    • https://etimes.mn/uploads/files/145244172.pdfIn PDF document text
    • http://dhf-china.com/d/files/58499153791.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76652253761.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf4f49da15---piluwakisam.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kg740e8rf10tnj21i0talrkhk0/ravaxawiwavedus.pdfIn PDF document text
    • http://abnicum.ru/files/file/kopemiteragemev.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/14939432370.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18eb092e64---59018831454.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc8971c05---1687703942.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cqk33d0gqjohrafoe6h3cj9j91/4496022694.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/tobizogasome.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/10321107742.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bbd1bef1c13ca4e108e1c38a317a962/jupaziziwukakokufumexobeb.pdfIn PDF document text
    • https://spacio.hk/attachment/file/20218201148.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/28cbe1c0dd5c80026ea94e7a6bc2d4dd/3498737599.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/zijapexoxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fruits+of+the+spirit+printable+worksheetsPDF link annotation
    • 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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 10848 bytes
SHA-256: f75f2cb9d3dd46a73b2abd8ade20de718e9a5d764ad17e61f91679a21972697a
font_01_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 17948 bytes
SHA-256: 9f737f14f58e819c9867b2e47da9fb3092e8f4ca75e3fccda5f2f3bf612ea565