Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b3be9f2be4ea6c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 17:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f8727ac6179a3c315629328cd8e146a SHA-1: 1e2f6a9f35340ce9e6a83b496b61f71c1685c917 SHA-256: 79b3be9f2be4ea6c0cf50379642b12ac2cf2ae623544cdf853facf1bc24c8b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing operations. The presence of PDF-specific link farm heuristics indicates a deliberate effort to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=user+guides+templates PDF link annotation
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v2vq31vr709sb8chr6nqurabuq/mobek.pdfIn PDF document text
    • http://npas.ru/pic/file/kiramowimajekixajir.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/kojogususewuzokav.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ad7bcf6---mudaxukoz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6722554069---64790613741.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/25763202973.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/jogaxe.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fce2217d1f081bf7d333218d89dfbc80/kukujipoxitasava.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gufimuwuzewidojal.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/73731484050.pdfIn PDF document text
    • http://pronobile.de/catalog/file/67550527068.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/65388349579.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/16501211663.pdfIn PDF document text
    • http://gerocuki.hu/user/file/3915541812.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/51391188905.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/biriwanidapux.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/93484893313.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b6154ea3---27185593817.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/4624057385.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3a4c57cab7d924439f665a04d8061f60/44489756415.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210630063059-40520014223.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kigawedizasudotokojuwixav.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/49009806099.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8600627f8e---mudobasulijowumexirimot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 10616 bytes
SHA-256: 99d15006911d0d47c4ccbefeb6f666daedb51a7a4f8579761a712078fce6fd36
font_02_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 16364 bytes
SHA-256: 3a77cf16992d01dca728fb993fe688b2e3e3248e520a8774d354089e4afabe0e

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