Malicious PDF — malware analysis report

Static analysis result for SHA-256 445953dfedb648b6…

MALICIOUS

PDF

105.6 KB Created: 2021-08-04 11:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ed8d0482e6b7b7f5bcda8a952cbf47a SHA-1: a236a7c237e44668bc7c26da2514e0a9e4bd2bbd SHA-256: 445953dfedb648b683cca7f813fc8f16844bbf4bb713fdcb1ab7ccbdb645b334
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=annual+leave+calculator+excel PDF link annotation
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160896f72f2ca1---77993949126.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/ruxematedomaninedexole.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q1u80fqr040hf9l48joa9diphv/kozizovitanaloga.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/04dcca617bb622a2207101aff86511b5/tojuvefinowifemivitozene.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7b9d478cf4351c218ec130f14f75c67f/19882902119.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/6101816207.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160852df71b86b---bidilafanumeziwekow.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/aa599f63275cba0a6b92270483f095cb/sotimuxate.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/ripov.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/121958b20c2b06b2c49e5d6007cb6c7d/32524896986.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/muxofodajagizasiro.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v1g9ml48f8mah22lmoq6ngl5nr/mogowelaf.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c036177dff---popafomepabewapopoletis.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/69578107720.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1e0cfa80---mepedefazunif.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b004ef29c6---zedefuvoxo.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/badupoluropetoxolun.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/merijekanotuvanifat.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cabccd8abcd---50973721395.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/goputo.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jiwure.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/foxarapafigixegiwuzigafit.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/11628941014.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e8de52eb9aa33b1be0d126fdb700bb0b/52309411923.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a426e2af089---72308261376.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16192 bytes
SHA-256: e2ad764752cd4be5999c18614362e0cea8e9c563e7196d76fd0086f860ccaf5d
font_01_sfnt_off00013a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 10212 bytes
SHA-256: 6bbaefeab656c4e4c7fe90030143b81b22763fa1bf4440b90f2de2ed2dc10bbe
font_02_sfnt_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16972 17456 bytes
SHA-256: 0737476948760914d1e1c0a5a20e2c705f25b66eb420bd4e8dfab24110741451

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