Malicious PDF — malware analysis report

Static analysis result for SHA-256 affc1cd25c5a9e81…

MALICIOUS

PDF

74.2 KB Created: 2021-08-27 23:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 581283cb376140644d50c5fe6768ea58 SHA-1: d0ae6be87f68e4793cd1a1167d4c34bee370ece5 SHA-256: affc1cd25c5a9e817c1d718a576e6492e8adf1d9a71aed985e6c02fa4dc9b2ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress upload directories. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/33f48a8e6ec13bf4bd01071bf681c68f/fiwuxesopumatob.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/rivalekorusukoziwa.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc9318741---buxud.pdf
    • http://ghibms.com/userfiles/files/zisuvoxusej.pdf
    • https://aquafilling.com/userfiles/file/21841484156.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a751f444b66---gofevumuzosowolotupom.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0142457---nojaxisaxanimimulugox.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd8ab75ce---kevov.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a43143e1---fabedikubudadotar.pdf
    • https://qqhanoman.com/contents//files/84194550289.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784d8c47725---15688720699.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b9bbabbad98b02c708298b6d8d01a6f5/1696661147.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mefisidikadogofome.pdf
    • https://etimes.mn/uploads/files/memuko.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085642447352---79405116967.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/kafezolis.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fae31c7089---41445192244.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34143b733---57638327439.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3ee334559b2a3160dc7aee94db00dfde/jowiwezirukefam.pdf
    • http://pwmtqatar.net/userfiles/file/wotafegebekugefu.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c2b25b11---vuziwotatopisuni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ascii+code+for+0+to+9
    • 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_off0000c0a8.bin
1e7a9d511757d5cb534b7ef1dd77607c29b8e205e5bfe02e41cac97a9fe21688
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 16756 bytes
font_01_sfnt_off0000eb4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
font_02_sfnt_off00010363.bin
88b5a6484f8bfb71a6d0cdd6533ec6eb2e93842e7f84f6f643886b7ffd1db029
pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 10428 bytes