Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49acae3e6a52635…

MALICIOUS

PDF

83.3 KB Created: 2021-05-21 12:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd16a33f521185b3ed178902413a2f28 SHA-1: 9737e5834633985c76cc0f6a1b4dbe443938a25c SHA-256: f49acae3e6a52635307ca94c6e6cd66709dbd346f6b59b2b553f51f52d5ca4cc
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites, and a machine learning classifier indicated a high probability of maliciousness. The embedded URLs, such as http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2782029dd---59445076844.pdf, are likely used to distribute further malicious content or lead to phishing pages. The ClamAV detection of Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a00547e4---rekirugewigazisutifiwa.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2782029dd---59445076844.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a774fcb8---13020629404.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0d735ea7---31000081557.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c4263edd49a1e7b49a0d06c636cf44a/85710911304.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddabd6f92a---rajatatebigivutinozid.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6o5c7n6ts984epi8ms6moult65/gozegipebigodekezufij.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/uhj9dh6h6tanjadctmkrfbl0f4/95754656935.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca0ccb4a8---seretopodigukamego.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6f300ecbf20ec4e73a314f1c3330ae34/pupusebobiliwonupawexap.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b990ca686---pelimifotikinigitulogado.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160788afe71bf4---47070911464.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8271cb0b5bd2fea698397157a149fc41/58330896313.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a162cc440---kafebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+calefont+ursus+trotter+c14-+diamonds
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e5.bin
82e9d908d92d244447b9565a50d7acaa4962525338e5363c1c8e82bf4644966f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 5344 bytes
font_01_sfnt_off0001181a.bin
faebbd89ff1cf0e124d91eb646bda7f2b4b03fcf475bf6ccff24480227494503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 11796 bytes

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