Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefa455586783032…

MALICIOUS

PDF

82.0 KB Created: 2021-06-09 01:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: edbf790dfb241122cf3f04557f042c80 SHA-1: d496d553a4a7567172497f9b16d31b09c0c78554 SHA-256: aefa455586783032e18f47936a5f10663e5ff45094f61fdc269fa6f269c229f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The primary URL, 'https://allytemp.ru/uplcv?utm_term=d+day+old+version+mod+apk', suggests a lure for downloading potentially malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 https://allytemp.ru/uplcv?utm_term=d+day+old+version+mod+apk PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7pkf75eqjp0s34hseji9mjduep/41580134437.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dl1gmrf8johc566ch6sbaa8rd2/lapegekabeb.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/wozuzegorelanebewibatase.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dmr3cml53c7d5jgsb9i3p4at22/81401597945.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6o7kg984k3jv93ce4kvddlsdll/12360044381.pdfIn PDF document text
    • http://anupbolivia.com/images/files/basijilagepopinudibebitog.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29bb5bf50---fopadewolurisojiniteti.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d93137a50---xerorilogud.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87d67706c---95061773664.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/luribumixofi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f09kl1uvmn62h2gieji9otc5j7/4862983148.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e83102ec---75760752756.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f0ae4e5e5cc2a432daa0ef7b80e844d3/79078814912.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb2ba3e78---mamovavazeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 5332 bytes
SHA-256: 6cb72d62ca9e2d486b7d68840d5f737c825624536772a3b10e8b7802469ad35c
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 17388 bytes
SHA-256: ead3d307fa5b4567d32e29fb3e0d68c3cba3d25e96c5cd8ffc4387e7e0506cfc