Malicious PDF — malware analysis report

Static analysis result for SHA-256 a606dfff157d45d5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 06:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46d93ab991250de18b8bc23956b44eea SHA-1: 1c55cd18a52e473f638d8a9b09dce0e027733576 SHA-256: a606dfff157d45d51ebc0279b6eef56a2d8d37c1c02208127d8f9afbf2320a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=watch+deepwater+horizon+online+free+123 PDF link annotation
    • http://szyoujin.com/UploadFile/file/20210917122628956.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48202040973.pdfIn PDF document text
    • http://smogy.ru/files/files/xamosizadoseril.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/72780697749.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/90226367345.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/42094289488.pdfIn PDF document text
    • http://novichiha.ru/pic/file/98022411790.pdfIn PDF document text
    • https://media-get.com/userfiles/files/17731059453.pdfIn PDF document text
    • http://vejwun.cz/images/12375552546.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/42139408279.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/18992042112.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/vogef.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vekaxozusemodiromopadapak.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/xaxojura.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd18a597d---nuxor.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6503395158.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/89428327578.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/88438184949.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d1c38f45b7a283a2a010cc32d0e45c50/27070832386.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/tasajipumogi.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/30936969517.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366b4181c4b---7309540552.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/56720828374.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/fexefuxowakuge.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/lazudelimelido.pdfIn PDF document text
    • 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_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 18020 bytes
SHA-256: 8042f8cbd0644df1d9eb9d11caa0bf3eece8e9d01ba6e4160ab1a03a03667d4b
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 11032 bytes
SHA-256: 692365ba3ccc1d576e92befacc70ab95ad789bcc3b868a04c2cc72a0c9438dbc

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