Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab56580212fb774…

MALICIOUS

PDF

122.8 KB Created: 2021-06-28 14:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c22e13e4095dd63afb8349c61bf99f9f SHA-1: ec44219e399b59852011b737657f2f9543712047 SHA-256: aab56580212fb7746dde2465bdb729b6e20d0602d9f6ec838c23e716d2af9d01
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a deliberate effort to obscure the final destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://audreyheselmans.com/_files/file/17138938963.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607683e15d121---bofitu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/eb2d16f29898794befedbcd614275e54/velidakanuz.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bd07b4f381f8793abf8a25f163fd3118/tunatudodurifi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/451b1cc22faee3d32523d2ff4a20ec0d/474259348.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096700103df8---13879088593.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/99194526565.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6ba88f9f---luxefimoxoge.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/luzoduvoda.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/uoq6fo641khqp7clsu6lclg8lq/81073466655.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609185e138025---pejalujis.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f059a8d75---22959164469.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/1371530547.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1715329362.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cffa89579de75764e51559fe395bef63/jopotesaw.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/aefceca6bbe5524c3a3ab5cb3dd4ce8f/46476705002.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/9591556541.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/xosukefeliletinixagazakoj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9ced1146---luwasotunamarubivigor.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/7fhmlmiivneg8rjkmpqen13h6s/fanatidozeludir.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/88909626050.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160855fcd957c5---40982867062.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/52bcbe6547b4e10e304226d96233fac7/lekolozek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=recticons+icon+pack+apkPDF 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_off00017a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A65 19296 bytes
SHA-256: 3ddbe834c8b1392822b7e754db898040a7984704367125d26f245a927ee6c5ca
font_01_sfnt_off0001ad04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C51B 10356 bytes
SHA-256: dd4d4aee9d6c2990da1d9ba9f28316e1babe0702894eb291639372df9b126bf1