Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab0a6993a5e1425…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 12:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51ec8245d17155ca3017e714143a1044 SHA-1: a122336f4db6fc16b7fd2fd40c51245dd1e60c7c SHA-256: cab0a6993a5e14258b80577fdace238a738e4e40dbb45c7ddff9a7fc2497fe32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious websites. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=best+ayat+e+shifa+pdf PDF link annotation
    • http://alnoorcity.com/userfiles/file/59243663960.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/pifetixemoridopiv.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/97170579272.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/57921678260.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/31835087794.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e9dee37d---93407326829.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/52129652504.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/eico5hi80578m7s735tqj2523i/34310888973.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/42699489140.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dafd649d---pafuvebun.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/sifeporanupiva.pdfIn PDF document text
    • http://client.diffuse.info/files/4173242212.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d249a224---piroxukabesamezetogaza.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608167cae6468---taripiputewisun.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/dukebutidepejudiso.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/baseg.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/brt1rht619gj1073q2fq0bcp16/dufebazuzimoferu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4b8075d9fe6df7b688dc6b9db2d2960f/zonovazidadut.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/97cda48e7ded3649bc66f8ad68178ef4/fejetimefogexibe.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/38226777578.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/9582391331.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d516a388e6f39d5e9e110df755873529/zilaligosopitadugoje.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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 16556 bytes
SHA-256: 85e46693f604df5d1be5bf7ca993f69e02765f8d499624da4bc97bdac8f09bbd
font_02_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10392 bytes
SHA-256: 08b2e16e224fd38a19b901466e4afac0c466cc1679b57e1797235f50777c0c37

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