Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee92d9759fff9c5…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 22:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9811dfe994fdda7c10b6602129ed0145 SHA-1: 5f4c86210e5e1a0de6c2870dbbdd5db2ebfb6547 SHA-256: aee92d9759fff9c510c12cf04a31767baeff22cf12be8023434cf2a2d329ff2d
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites, likely to manipulate search engine results or lure users into downloading further malicious content. The presence of multiple links to compromised CMS uploads and disposable hosting reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://angelojrobles.com/admin_initial_test/userfiles/file/xafufelusi.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/97299224560e981a9c9bbd.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/jediwatulupegu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70330d2076---ximosataverati.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/dozuvixud.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/xikami.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/7037aff459dd0550eff679ee62b737ce/suvulokekizuxev.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t0dbghnbrag7mlgqmptckhb7dt/kafixefu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/66838257442.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fotivesalipulumeteruz.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/21923160184.pdfIn PDF document text
    • https://langumeistras.lt/i/File/37000632697.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378e7e33ab---pewejufibojisuvonekoge.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nc1fghvh247e7t0u30drs9pi16/vuboraloxizebobu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/ropexexala.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/wubusolabam.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/newubam.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107532abe271---pibakatujegakudobom.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9169e1222---39577617041.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc56a7243a---jugofalixejabalodojoni.pdfIn PDF document text
    • https://le27.fr/docs/file/4635941086.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6d9772f4ac7843a778148093023f2609/xemaniv.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/6239284625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mat+previous+year+question+paper+pdfPDF 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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 17388 bytes
SHA-256: 91c88667f06ae10b7bce39174f98145af604422731cc09698254ac2dfd50133d
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 10864 bytes
SHA-256: 25d5800cb9a938dce196568fdb051b3eb718d2da574925c7743e765f3da821bf

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