Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ef7d65e77bbc96…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 11:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d7775f26c1110da6d7103ee236fbe1e SHA-1: 5a114db213578671ddd05fb536abdf919d8bc9b5 SHA-256: a5ef7d65e77bbc9608888e6485eaf8d258900efd0fcb564ae2a3f6aaf39f6569
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089e062a9250---13358844918.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/sokopozewipobi.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a424b6ff6---94602906854.pdf
    • http://caopump.com/admin/userfiles/file/15230475413.pdf
    • http://studiosantese.eu/userfiles/files/73984067248.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/29af0bd5b696d4db7965b7a1e5404887/50128296965.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9fe7cf9fef3ed3a4f813cbe2fbbcfccc/96614251836.pdf
    • http://wienbildarchiv.com/upload_files/files/timiz.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7k3vuotlub3bua6t1kvo6iqunm/gunuketetoza.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1222ed3---fokidefi.pdf
    • http://windmill-bv.com/userfiles/files/78259651390.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f9f3e1fb---77909366310.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/560b537526a71ca9ce35b98a68abfb62/4720586830.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbcb7c11367dd25ddb7257bcf11e4518/95390859755.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d7eb3650---vojadane.pdf
    • http://bienbao.org/uploads/files/vigorase.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/oqa1dv4rmtu0ga7klje8nhe193/12596738985.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4730268c5e945f20ad4e4d3f07357aca/lixufogavo.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9a4lvtfmeg73kb97me66g04p2o/tuzigil.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3976b37801---zuzozekiwuweludanebe.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/xigodafitejitavirelera.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5688d73e0---19378154930.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dwarf+freshwater+pipefish+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f696.bin
567e557970a7c4939c5825abad5635fe514a0349c9b6d7f4b1c0f1032416a93e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10436 bytes
font_01_sfnt_off00010e74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 16792 bytes
font_02_sfnt_off00012686.bin
dc7073ccaff81202ee573256c06c3f29aee62be3ab49aace4544e45fe5a19226
pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 17796 bytes