Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6a72426fe66557…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 07:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4845d4a90a5b94150f916c3fa68e760 SHA-1: 10fb37c3a5e54df29230b15fbcb0e0e899d59f82 SHA-256: af6a72426fe665578d1c30cee64a4cbaecadde6de1bed96fe461867ad0802cf5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=definition+of+liberation+theology+pdf PDF link annotation
    • https://ecohort.com/userfiles/files/33726002393.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce229b5b750---42431615135.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/mowunafipumepawozumil.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cebb6f164e18d9fc5aa4b19adf43c6/10825283805.pdfIn PDF document text
    • https://migger.dk/userimages/file/tukakukapus.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/lebiwebigilifelifamapupun.pdfIn PDF document text
    • http://iworking.vn/uploads/files/59524993102.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b9c76518b948d24695c267b514b8182f/82967690672.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/99497218203.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905d14e299---jumupevamo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607506959d56d---60279171004.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/vogogofexuzoboj.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/38058576685.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/xibipobewagureropisufised.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/vojenerabuniwulipifiguj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40320b87f---14243803989.pdfIn PDF document text
    • http://sns.hu/_user/file/bopobok.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/hbhij4mubtgs5dlhn065881iib/32578569652.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/tinoz.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/kuxatowutabilawiwako.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nuronanuzimumodasika.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/bapiwetodowa.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8979bd40db---8726890776.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-25/20210625200944776264.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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 19972 bytes
SHA-256: 25d91c2433933c0b5ddd5f44e20068424b155d9771ebfbe51aee68d660b91fb8
font_01_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 10864 bytes
SHA-256: 4cd94276c530914873b3eb312435d286612be7863f8d810d2aa8924dcd6ad337
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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