Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7858dd38225144e…

MALICIOUS

PDF

97.1 KB Created: 2021-07-16 00:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1678735d83061aca5a1cf848c606a0d SHA-1: a33fee88506581885dbcbbcb6334cd7fda5e80b6 SHA-256: b7858dd38225144e0131e57d4344087062a2cb9993eeba952ce912519a8bdd30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host malicious files or redirect users. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d6f7c17c---31970931525.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf58a122e5---pilenuponupewububikefox.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9cf53k5beumsalg973qosshdb/kopabosazirokefobeliv.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/34446822692.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a63dda598---47890359729.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160782ad9a550f---tasinipariga.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/42dee7ffd91478b07e4c95d9e1198ff7/34285041922.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fd94b28dc---31576340502.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5d63d360bb4f94d1a76886c77638bd45/lozekamekizepokaja.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b3bd079c966be1b878edeafe36b02805/94957723602.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/231f7ad6dc5dd6f6520027b17a70f484/zebemilolerati.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/6c83117ef29e46fb793298979414be57/polelotesitoro.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8da8588cd---48216437346.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2729c1dba70376b2f1f14aa7b6260a46/fikevadifisotagojujanak.pdf
    • http://jrpst.pl/userfiles/file/98266626520.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/le1ie8smjbbatn4bvoaalotbs1/sudup.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3735cd2a---laduzenowenomike.pdf
    • https://fceresources.com/ckfinder/userfiles/files/kenanavunogovebugo.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/24bf85b513a558adce3c806b561a5cc2/sepogedefu.pdf
    • http://connect-senior.ch/uploades/userfiles/file/zutofatodoje.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/856f37552af23011a0f0e6214b22b88f/xolobuwebuxevovowevivir.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbd74bb2e---20378053860.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2c537e3a---87237019195.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a770113f2ca098963f2a147915bd7ab5/litanoxurisofanakosag.pdf
    • http://alimentosldm.com/userfiles/file/napejitefikila.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+course+in+miracles+lesson+26
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee2.bin
83a0a2ff219a554ea6564fc77e1a2a42f0cc227b31704d8378ee77833f1154d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 10664 bytes
font_01_sfnt_off00011751.bin
842af5b8e2550b7bca1ac7ac6afb9b6818f86e564316532b8695e183511e522f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 17512 bytes
font_02_sfnt_off00014446.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14446 16792 bytes
font_03_sfnt_off00015c57.bin
0482ce3417cd62bcfaf523b242ecee26fac03fe1bbc3e22cacfe641e84426aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C57 18436 bytes

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