Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf64dc34fbcd9ab…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 18:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 753a775ea8381831368b49069e4ed966 SHA-1: 12e10045c4d38368c4441a24ee8b4d77e757e9b8 SHA-256: 2cf64dc34fbcd9abb6f1f3f40d01149ccedc1839113b6d8c913abc9a62ca7498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://irlanc.ru/uplcv?utm_term=what+shape+has+six+equal+sides PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/18312d7470dad9c937ffa01a7a3e01a3/9679387623.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085edfd20bef---tasazuwu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c966e15092---82018578000.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/33888180462.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/53707537086.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6d8169e3ba697249c82ad864601f3c0d/12623900572.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a988b491a1f---pijubiniwusezapugije.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/494886fdacbfa40abcf75e83d4c3128e/rajarej.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/45c999caeddf656ee31984b08dfeaff5/9012129606.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76eba57e6a---77194664499.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4aed4a876---7239029581.pdfIn PDF document text
    • http://domainecomps.com/documents/files/mirekodowexubupimi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/a7pdtmtr4km2v9cjf5vku1oapl/dilofubukotagisezobidil.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/33585750406.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afeea7261a---14094894276.pdfIn PDF document text
    • http://tai-group.com/upload/files/dumexojoraguvukimebuxi.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/51950303758.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/fd32f9ec047f2d957954e9de82087a67/mamuku.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baca90621b4---zobevimesosafaxemi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da34562565---52989371526.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/260423154533.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608972c983120---vobazobodow.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af6d9a40e---waberirovibupumifutimepos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 17060 bytes
SHA-256: ca2953a1182c4fb309ee856b18ad9fcf034f40d8fee25ee9f25e3069a35f514e
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 10504 bytes
SHA-256: 18b32d1c5239a0370303ab780efd6bf723904445827ea5035366a67083b08ec5
font_03_sfnt_off00013fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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