Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fbf671d18e0a7d…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 22:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d866ffe9698ff62c51f700709ba2a1d SHA-1: f9e851628cb857476c66db4a4312ef5118aa3833 SHA-256: b6fbf671d18e0a7deaf6a0e3b004e0e3c4d19fc3c3c0510c721ee313721ad353
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that redirect to potentially malicious content. The heuristics indicate that many of these links point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute phishing lures or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=top+polluted+cities
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vdao4plf8vne2bprbk59u4kp70/nutoligiwomotev.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cae7104e0---bujezufud.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mibanugidok.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c02579996230c4dfa1d79a6a8dd9c196/74772045883.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e4bfd31d6ca81272e41fe4149cc74898/91986501836.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4bbbc711---bitevezufafiga.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071af1cc5bca---96314654928.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa034a42d---fesojijesumovumofiw.pdf
    • https://mimpiindah1.com/contents//files/megubuziwarep.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lig50o2unhb7gho3etkap3pks5/mipotalixes.pdf
    • http://www.pranabkumar.com/fckimages/file/diziteroneson.pdf
    • https://pacantioquia.org/aym_image/files/57053395798.pdf
    • http://www.sport-konyv.hu/userfiles/file/danenejuteginizon.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d806815a---45791758112.pdf
    • http://dermaktif.com/imgup/file/xafanuvogewiberijuf.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5529fc53ee---fijekolawizazikusuvubo.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/99935094872.pdf
    • https://fallsplat.se/file/xisixuf.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c9dac0f3a33c609326d6140c3884cf4b/77490394079.pdf
    • https://airbays.com/userfiles/file/vedowobenimepexusez.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09b9f236b---19500397863.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/93d2849b77f5187709ea9cd916472555/91724287468.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45a2a764ba---25199162008.pdf
    • 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_off0000f247.bin
a71520b8bd8b19859aeac1fdbfcb6b77b9fe9d777a4ecb7084c7d630e1969f44
pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 17364 bytes
font_01_sfnt_off00011fad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
font_02_sfnt_off000137c4.bin
364abc20826f9bd3dbb71749b74d9b2fe2b17ca078475d53cdf525f42c48079b
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C4 10204 bytes