Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6369ca1a314801…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 18:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ff4a116890553dedfb17afdf2076a6d SHA-1: b8e8bbed3a420639cf8b0315adca4eb7e7ca7d26 SHA-256: 5c6369ca1a314801ada754287e8a013979bb0c6490dbc325a92008f72ce10a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress uploads or disposable domains. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stphilomenaonline.org/userfiles/file/46133964092.pdf In PDF document text
    • http://realestatemiami.com/userfiles/files/surapazedesupepedoka.pdfIn PDF document text
    • http://benly-carson.com/product/files/wixuzu.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/jopixifo.pdfIn PDF document text
    • http://maihome.hu/admin1/file/83932802013.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/sojisamujapesiraruwosi.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xalegumejopexarub.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/j3rrf0fb4mk8prrbd9j0nmqdi9/8989818007.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nigudezafubitovonadixenev.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/keragop.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/33533360914.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/12527636688.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/rewepedoxekuzub.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/99759042901.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/po8p7046eeuv3hbonmn6qf7ch6/nefozegisibunaj.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5bebb9a0---bugugilelox.pdfIn PDF document text
    • https://empresa-venta.hr/files/61460443648.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/16337302319.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85197414e7---13579239483.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062801470373499.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/ronipugipodil.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/15048399756.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nonugobifugupu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8a0b80c6f079758d9a449fbc2752f573/xasujapigodelimep.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/dojokirivinajabobad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+websites+to+download+pdf+textbooksPDF 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_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 10864 bytes
SHA-256: 325047e65ae7df5056a6e322e0753585f85bd2f9d3afea19c0dc319f55823e53
font_01_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 17564 bytes
SHA-256: 7dda1612cd38afbbd9d7eb9a6eb3a330986741ba0489ef6e1c469a6555962a75

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