Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf844325282f6b5f…

MALICIOUS

PDF

106.5 KB Created: 2021-07-01 23:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b10b251e346c18e08ada746e41db07d SHA-1: 53b9e5c7abbc055bf4685058c41d90a18b4a8f58 SHA-256: bf844325282f6b5f897aa6be8b1065728e2503f98d4adfbace0ad6e7e15616e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://drafthe.ru/uplcv?utm_term=lowercase+letter+m PDF link annotation
    • https://an-professional.ru/img/files/file/rubutagozigusib.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/negage.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/96350259094.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/dadizuno.pdfIn PDF document text
    • https://cecprint.com/images/file/kurinaxisefemu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/sunojomulod.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/njgnp1ha4jruhlhreninigs5mf/34592430213.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbbbac09f---gepiwawunadazev.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/27254332188.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/30324032820.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/7871411282.pdfIn PDF document text
    • http://brlairport.com/images/file/21971854032.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wonukaze.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e081a5a9e24f1c1249204e0cb83b572b/geralos.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/kuroxer.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ac8f50302a9480a182d217bd130d6250/mafawedalisozupovo.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/77452801150.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9498577fe---bufuzobuvirawixuwefij.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pulogituxabugexivoxazibod.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609773b54904d---pofutixutamob.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96e6bc91c---52850755568.pdfIn PDF document text
    • https://ms01bet.net/contents//files/lakogowedawusikirateku.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/rutapubuxanaxagejemiwugun.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd8c388f---gibomupu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 1752 bytes
SHA-256: 33f05ec733e97d5aa32406b38b573ae18d281ed9b39b8d80a5abf6d034bac88d
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10236 bytes
SHA-256: 91361990d5bf8644c80cf7f029b02e34e8463cbde541d92e11681bfbd9830a1a
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16256 bytes
SHA-256: 3988806e0a2c5916095ccff159b26d5fd98637e8f95324bcad6db487b5a1e749
font_03_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 63004 bytes
SHA-256: 17af298bb118ca3a0c8363f2ea09d630b73654acdb0ff881b50ff27a17b7600a
font_04_sfnt_off00018460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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