Malicious PDF — malware analysis report

Static analysis result for SHA-256 391e628d05276ca7…

MALICIOUS

PDF

89.8 KB Created: 2021-07-06 23:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03b78e3095eee2372bdaccd05bc69c46 SHA-1: 73124c498fd03a9dbc079a22deb6d6adc082e84a SHA-256: 391e628d05276ca7074427ad80e0a6fcbdda6327b5ea1e00af7e77cd3ac19a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

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 https://nomylo.ru/uplcv?utm_term=credibility+review+business+listing PDF link annotation
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6315aca81fc91eece2a4a4e8a749c348/95661377535.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3757fd82---66260925925.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fa51sm4bmrv7ss9jv074ishal0/68113408882.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/43668904037.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/zuvibifunilulezekat.pdfIn PDF document text
    • http://ttc-investco.com/img/files/73675221937.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xadugofewumivitofarona.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc73ecfe5---mozekezurenezonafomujife.pdfIn PDF document text
    • http://waypl.pl/upload/File/potikidifoki.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2ff42d19a3d5d852a7aa2e02610196d9/runaf.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19c844a68---xuvazevemitipotebuxirinit.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592e30c7f---69476591192.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/rilusejewovunofidarokir.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lajekozirinifuw.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d27410520---nokaretod.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d377a42ab5---zemewovutopozulomow.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/muzasekivuvuridofigufoki.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/45929777557.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9968c196446e3651806f1a37f03ccd2c/bazope.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/sitazama.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/demekepizawe.pdfIn PDF document text
    • https://zold-kommando.hu/files/34771375434.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_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 17168 bytes
SHA-256: af48a948dfb3a5f7f6df49d0214eacc465cbe60164fcaf5f287f22f9e5f78c04
font_01_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001417e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 10676 bytes
SHA-256: d15e52949dd83ad5d25aef50c2c85c669134121a05ca9e7be4445186991200f2

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