Malicious PDF — malware analysis report

Static analysis result for SHA-256 458f192d1288ef51…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 11:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cae07e229a4bb602264b998177c84241 SHA-1: 8f929e2f2e431f121ae2bb133eb4ce40ec2a9450 SHA-256: 458f192d1288ef51f309b842f28eb113d14ab5cf3d93257297875fa2cf44cd83
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many embedded URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated, but the presence of numerous links to potentially malicious content suggests an intent to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097828a4d1---jisinofedare.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f625f7c706---zeziratojojojo.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/geguwusozifid.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/47970900389.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/21292546666.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/pibezi.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/vivinakodafafedu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137858fde363---21600560783.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090713424610.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/60029932570.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/robuwawujikogez.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/pixetegab.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/29004520921.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tedumazawugusuvifes.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/zefelaf.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/70867903594.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1092ffbb0221dfda454f63f2508d2968/59161931360.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/salafukoxakopiku.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/sinewaxewimosomeme.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/rakutilibeke.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/laned.pdfIn PDF document text
    • http://taigesw.com/upload/files/jodevuxixojorubawo.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/vuwologubaxidelikifudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yahoo+setup+for+androidPDF 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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 10632 bytes
SHA-256: f6740277c525a48fbd52e296360b234f3f87bafebd7675aede752cfe14116716
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 18984 bytes
SHA-256: edb8914766c23b4b275dba8ae2b77146fa07d8a700b072533c9e758ba2ad7595
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1