Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5a20595f909a79…

MALICIOUS

PDF

90.6 KB Created: 2021-08-29 05:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 243872b64fe3b2882ca7a4352dcb0c95 SHA-1: b62eaef963b39ff1c7735a7fa2939bb51dfc8d25 SHA-256: fe5a20595f909a79233dbb74b1f1439dd0b5d3b5701e7e642115a7ffb5ba40cd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or potentially malicious websites. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dagvandearchitectuur.be/_files/file/8310119840.pdf In PDF document text
    • https://hansenlight.com/UploadFile/files/tomitu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lu8ubi2n30hom92thrcg31f8d0/8508144834.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/59cfed35b9469c6c9441935495dde42e/tirexunovupato.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12kk619vbg7j16gjmrbf78ml34/17162971530.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884e2fa4430---24681431061.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070323f9986f---76590002516.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d309961106a---lopiz.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/64613209587.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/70081215786.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070802dc1591---waleluxijuliwiw.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0dd1cec3b7---49142045337.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a93156f52---wedenu.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/ced9d741a4cf93269550683523629509/87294109435.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8418bbc977---mevexud.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/745ef67c409805135556eabbc92ab13f/38522037868.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/53242220230.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/jexadimideregitafat.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/29099142740.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/14897277159.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/86902002455.pdfIn PDF document text
    • http://besteva.com/upload/files/muzatuponope.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/tukurusulivute.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/79114216605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=examples+of+sole+tradersPDF 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 19288 bytes
SHA-256: 9620a643cc28d6fe2541337e7edd6d3aadff3f8854a28da50d6bd88ae76a117c
font_02_sfnt_off000144eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EB 10548 bytes
SHA-256: 986ece93741c62afdf58131a9f138bcefaa32da1c8965fd30b6a969a3672a114

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