Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d8631137d688bf…

MALICIOUS

PDF

95.9 KB Created: 2021-08-05 07:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd749d8165a1c81e26394040c7a6c3eb SHA-1: b4d364fbe7000e5c1dbd725141abddbf0e1f04e1 SHA-256: c4d8631137d688bffdc6a302abf5ab291c95aad0bcfa5c2f9e511e444d9418dc
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, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=monografia+del+oso+panda+corta PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/aea7f1a67a58f865df6569666ba8901d/xixazigoweloribefipopolun.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/gawudotepizuj.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/sugasuno.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ah0atqhdi97a9jkl6lapvpmqmm/31654601531.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c5d72373ca9d544612c2555627a530e/jemaxuxibudikip.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/5nc8njkgcjs82e507pri4tnr21/xoxejado.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/99884028862.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/db536fc1b42b29a3abeb52552801162b/93069171217.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b2924310efde4cff4e1f87583285cfc0/lebatufujovagotix.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe4e2b100---35943459773.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/finupukuw.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/en006ah8d5smdcpmc0df244ht0/73408517642.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0afb8d306---70849842138.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4446d42c12---75130533278.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/51671687801.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0145c1f30---nesirewanixolopibugejizux.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c666de84fa7---tofuro.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c86a1e2e---fiponetilizemevuguremi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11840a4e5---30274143803.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7e8a3a1---31987922639.pdfIn PDF document text
    • https://epiphanych.com/images/file/3866965646.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/gedufit.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/wikexi.pdfIn PDF document text
    • https://majubesar.info/contents//files/neweroxavejemawujita.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_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 18796 bytes
SHA-256: da8fa60e59763a82aa8735b9bfa0ea67a1dfdb799372582fc3af7f28d555df04
font_01_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 10788 bytes
SHA-256: 0aa5ca34fc77ade27436858646d885ac7c28a1bdd19ea31d8b1a3301e5818b76
font_02_sfnt_off00014e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001666d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666D 1976 bytes
SHA-256: 1fb37b1af884e9e3616bd74ffa314a21f4725d3003d37303e5452de98766d43b

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