Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39106e9cd29c9b9…

MALICIOUS

PDF

83.5 KB Created: 2021-07-02 01:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e2e58f25fa433ddd6d3eb468da1502de SHA-1: 62e789deaa2f934f6581461e8ed763015dae9d17 SHA-256: c39106e9cd29c9b9bee251517dbc1653bd1cffed1c09391a9445a21ebfaff1e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm that points to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect the user to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fornacedelia.it/userfiles/files/47519574761.pdf In PDF document text
    • http://eksan-ltd.com/userfiles/file/banalorukugonafujovakuj.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ac773ac45c96916639e943b868a4a245/16871359610.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n9qr0eroeg44r0fpdfqaauosfu/1722042792.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/8480994980.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ffe9efe3d---vuxumozogagamanijovawaz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b8e80693---zezesozugebugumezasogar.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/8124271954.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/31044832464.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6e210815---lowitoxazej.pdfIn PDF document text
    • http://asfalon.com/__files/file/82704144850.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078579cb826e---45889314446.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/06a44b2b8d6dd26ff128232b0b9e655f/17900159913.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4e59be0b---wutujireredudazarilozene.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/41332350206.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098041a9b5ea---40352830961.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xitimuxixilejonixulix.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/wonexurunosisovefaz.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083036f7c53d---32184368821.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/61031389286.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/af901d421b416ce6781fb01fc03fca18/rediferuwegutat.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/11270385730.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9141d87a6---fitibeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=a+lock+upPDF 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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 9684 bytes
SHA-256: 8fa64f8b6a1b4dfc4e18a389d850b492e7a11377f7b7eb40b8e6dfead8cc63ce
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16784 bytes
SHA-256: f67368625b0ac2d160382476777404954b62a3b5ab5268e85cc9f393caabb05f