Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab4998df453626d…

MALICIOUS

PDF

86.9 KB Created: 2021-08-12 22:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b546d247fa3b883f34b553108922aabd SHA-1: 956f6cdfcf24fb6dc4cb976b8a80ef2031301b7a SHA-256: 0ab4998df453626d31d0fa3a0fb3c8c358dd9858942fe50022f780762740c529
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cf5064110---59385369460.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1eb1ee21---72731210810.pdfIn PDF document text
    • http://teraval.cz/res/file/ziroxiboxedijiwejaramu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/21077550776.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2867d71011---niderikegixoxabus.pdfIn PDF document text
    • https://ivanamihic.com//files/63972098522.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/43071311480.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/35210761049.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/h62c16pk5oam63dn0gltk2vbco/zuvegenubimivafakeliwer.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/37fjkifm9sqqlc12fabqtiapuu/26359183196.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c090ef94364---89145640781.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210709005942.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7c8dcb39df122f8ecccb2ee8d6bebd1e/46431351143.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/baraxujosif.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zonigulera.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/97922178808.pdfIn PDF document text
    • http://elitvorota.ru/f/file/negateti.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7589971354.pdfIn PDF document text
    • https://aashianarealty.com/file/wulijunetowupowumiga.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f128aaa8b8---mutoligin.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d2990d74448700f2e9f93ad95f174bf1/76915600525.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wosetaxelimobetobag.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/jegoluduxunujabodefixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kerem+ile+asl%C4%B1+hikayesi+kahramanlar%C4%B1n+ki%C5%9Filik+%C3%B6zellikleriPDF 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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10916 bytes
SHA-256: 58d193f3babbd2f5d47ea498291111d588f840fd0c1aa674c52c2713daca837b
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 19304 bytes
SHA-256: e8c1a5ef9df5c21261775a38b6d92b9ac4a32f2f0390b9b47352eaef39eef076

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