Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe44c7e62970ce4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 15:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d11cb30d21f7280d8817c58a79539fc8 SHA-1: 37aed894721380add86c8e31ceca3a57c865de41 SHA-256: 6fe44c7e62970ce43a2c00aa2cec42d8d7a8df44f4fcbdebbdce14fbefd49134
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates this malicious intent. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://incomsistema.ru/ckfinder/userfiles/files/najakijerazifojugeg.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7ace7a826bceb120368baaf48048fb09/14829069762.pdfIn PDF document text
    • http://pronobile.com/catalog/file/12347729884.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109182034224615.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/dobifasotuwejisisivopusuj.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jekegi.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/65777212538.pdfIn PDF document text
    • https://j26clean.com/upload/files/13086249360.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161405df160477---woranonefulotofogefof.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134efee76d50---53034233865.pdfIn PDF document text
    • http://thaide.org/userfiles/file/rodabakaxudopabipesadu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8aaaa5a96---mojisulolojeful.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/3068522054.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/jisivobubef.pdfIn PDF document text
    • http://com123.vn/uploads/file/kimad.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bbc4d62c9842537edf136fdc7fe4b49f/nidaserosasizixeru.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/pufuwugabefikiruziwudefo.pdfIn PDF document text
    • http://standdominica.org/files/files/26807539880.pdfIn PDF document text
    • https://produse-zilan.ro/files/94579769996.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/31346574041.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/kimibesoxelinelijikewun.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9425820a---nokeliga.pdfIn PDF document text
    • http://klhl.com/userfiles/file/17804870558.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/17/file/20210917_000953_147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=3d+music+player+apkPDF link annotation
    • 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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 18072 bytes
SHA-256: 6942131e09c08e13a48c9a86c79c67467227ae60b5e65964e5723e58171550b7
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 10736 bytes
SHA-256: 3bfefd7df7da82acc3fe3b6c25076f42112ccdb093eb43c3ca6bbcbe4c5b039c

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