Malicious PDF — malware analysis report

Static analysis result for SHA-256 6116aefa46d20f2b…

MALICIOUS

PDF

83.5 KB Created: 2021-07-26 17:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8a7e4a81236970d7581005399a352690 SHA-1: 461d8a1d351e82bd420def057ce612400bc1bd11 SHA-256: 6116aefa46d20f2b113403b614ed3d33f6014a16751f2794c049695a2666fd40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to host or link to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://upbfassadenbau.com/upload/file/minazugizazifeke.pdf In PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/fosiwunewanimexodomawir.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/meziz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66673ae8e---dufusivifozarejofaz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/7386c79163a298dcedf8ed020349c780/99212126586.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1b233a9e---xadareridepoduribes.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/vajaleserepepejo.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/podazowajomifodaduwad.pdfIn PDF document text
    • http://soupworld.de/upload/file/xibadez.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/rugegi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b6b685ec---74002133291.pdfIn PDF document text
    • https://hssanesteban.cl/files/42950898927.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/9216884040.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/26175681147.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/92e59bdccf8c2ba8e4aec5d0cea28439/legibus.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dbe1915072935fd4a023c87e89d8831d/filogurofelen.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/40455851118.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/41116722716.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6c77cf88---juwoterigidatomivu.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/2863174889.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nq19u86vqi08a0lpdpchlk1cgm/mezovigiguworofedilapepup.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210613145826809569o2xsi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf3cbb91d0---95829623431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=atk+mohun+bagan+kit+for+dls+2019PDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 18196 bytes
SHA-256: c7297f947ee95c61324210ff94e4dce44068059e95d2162e83b7a306e3bdf13a
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 11444 bytes
SHA-256: cbc1c76ef270f1bc9c53b2a02caba743411291194dc494fcf5f9c9906875954b

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