Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af2512e81719d73…

MALICIOUS

PDF

76.2 KB Created: 2021-07-22 11:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea28c7cd12197acbacf9509a592ae879 SHA-1: 5d7adef601457c56eb74c9e497a587f20f7eb92b SHA-256: 9af2512e81719d73a389dffff536d79b41966b306de31e05363857930705e991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or lead users to phishing pages. The presence of external URIs and link farms indicates an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kisikana.hr/userfiles/file/91932373701.pdf In PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/fefixifulewosi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc803b38d---firawebizurufozasu.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/vimogofapiguwiduboj.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3587d831afd636c23ca8d23892c8a81b/38704893291.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2d7afd53---88330820805.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befb2317ae---67327316500.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb7661d04---sanosikopunu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c144bd98d7---raxidobarijubogimo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wowisexenix.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/fp23evfdjj5u2ubvs1qhboccr1/8641219070.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n62u0q3k1n1dba4tok7ro1dpo7/pixuvevakajum.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/21655624277.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/10462937212.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/cb2ec6f6f384cd13409fb379a4b15851/sutotesafemeseguxebosokaj.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8a89b770---67504766190.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab77f79cb4d---69410975455.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vemideruluwenanumeruzi.pdfIn PDF document text
    • http://heizler.hu/files/file/40059252069.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160748af135ee2---72063338046.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2d07a594---13692140817.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/dojaxusixa.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608963c1d06ab---guwafepejijagelomogikugul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cryptography+and+network+security+5th+editionPDF 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_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 15768 bytes
SHA-256: 2ec54b6d590e951095f7379fdb0a777e7a91360472da4ab242071e6bc5f244a7
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 11304 bytes
SHA-256: b015b06c240d78b188e46bf8065f06eb161ee39b4a04216f68465b482d1c82d5
font_02_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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