Malicious PDF — malware analysis report

Static analysis result for SHA-256 59179c2e54842c85…

MALICIOUS

PDF

88.0 KB Created: 2021-06-10 02:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 172ede3dafff72b9c7ec42b14ed74801 SHA-1: 4deadc8456250cc30118e379a8035b2a05f17b33 SHA-256: 59179c2e54842c85593970301e07b3638dad32623c402d60c8f3b5f499ea88c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or conduct phishing. The presence of a URL with a 'utm_term' parameter further supports the idea of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://medvor.ru/uplcv?utm_term=how+to+summon+wither+storm+with+command+block
    • https://aljazeerahpetroleum.ae/userfiles/files/zivivutarakiji.pdf
    • http://maility.pl_adresuserfiles/file/74922559906.pdf
    • http://usateatop.com/_upload/files/63746349493.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/48eeae3ceef08635a581a8226f57afd1/17668171003.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607112ebbe15b---bekav.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/301pc79vnl1tvf3b8f1sn386j7/30718733030.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae181d366---79012772430.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079918c37f43---metuxukogatiso.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1ab58284---wofibofubisem.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf78714d26e---99246066134.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9eb570f827236c61c215381edf9bb6a1/zuvidugijow.pdf
    • http://dfh-consulting.com/userfiles/file/xugubon.pdf
    • https://partnyor.az/userfiles/file/gexeniwosuniwopibes.pdf
    • http://porpora.info/imagenes/imagenes_contenidos/%5C/88890542297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f809.bin
f56a55a867e666dcd7b11980e29d29970ef0407542ed7aed2fe7001b6cb26add		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 5320 bytes
font_01_sfnt_off000109f1.bin
168123bb8f8caa0b11af492b4557c9b009408165c0c4b76337852375a853252b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 13040 bytes
font_02_sfnt_off0001336a.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 16036 bytes
font_03_sfnt_off000147d4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147D4 4324 bytes

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