Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f05fc81661fdee…

MALICIOUS

PDF

85.4 KB Created: 2021-08-15 23:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1631b653aed3ee07ae5719cb7c78ce4 SHA-1: 4994147bc574dad7e6f8b745b251a0ec6af115c6 SHA-256: 57f05fc81661fdeeabbaf80a584d411c913100f34151ff1613975d963d58ab79
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on domains associated with compromised CMS uploads or disposable hosting. ClamAV and an ML classifier flagged this file as malicious, specifically identifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious external sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://ifa-astrologie.de/userfiles/file/54760579829.pdf In PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/45669497336.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161066c7bc4940---dabariz.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feec3e5f3c8a20cdb6fc18f8348bbf80/2322050705.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/18857043766.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/92437578880.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hl03hapepiofb6go6e4mhmjad1/67910928353.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160de5678ea035---zejigubikenuni.pdfIn PDF document text
    • https://tcremich.lu/files/files/zexaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d4cfd596b---69950981566.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/74094130319.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/wulijusurinusewadafobug.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/357250133e0429b263d1ff36249e62fe/28079049375.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad6b280a6---99990326116.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hbmofq0p7g8ak60fbhtp94bii1/duvimedekoxazafiloj.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/79676566160.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a74e0b7a1df---43763097038.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/vewesusopuvojoferipufapu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087841059088---67340652098.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/28h14igq2svnhf792lh3ndj66k/10238699725.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ff79b602203bb2b14ccf045a4aee7120/katezunokefevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=orbiting+jupiter+chapter+2+summaryPDF 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_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 16852 bytes
SHA-256: 092a6c8cc1fa4b643abab4d2b12db23be911a63a14e37a825348ea61e0cbe6d1
font_01_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 11284 bytes
SHA-256: c47f9549abdd355573201014d97cc4e837da74a68463df93202c60a6376b82ad

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