Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4d44243e0e5958…

MALICIOUS

PDF

108.4 KB Created: 2021-09-01 22:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16ce4852f8e6fb6433928161905fd401 SHA-1: 2d4f329e8a7abf37b446209a8993fedad265aefb SHA-256: 0f4d44243e0e5958af6f560823c139b47f23a558ece5bd111e59c06ccccf249b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=center+for+family+well+being PDF link annotation
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/xiregiwuvob.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/jewixubidutavopubuner.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5575e73c6---vofikugelufa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9cd8c741---xuparokexixikesul.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607369adc1634---9235180161.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/mivedetejugazibojukorono.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/82806561627.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/lilanujaxefaxora.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/60a825f25fdac19d8559f929e9c907da/jasemixedigikewugixowe.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4b4983ab---buzelanigax.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/rajafepibivekanadowujej.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/getodubupazo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/bulagivofogovola.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/df30ef757289e0ddc89e9ea2a1f71a87/junoxu.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/69813658983.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ffb6fb6b75305e36b30c69dd75dbdc46/55055940010.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/gorazuzu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c976d8f4ac---72520554714.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/60532658780.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4c459296---68034534030.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6629c025---74072325491.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/vutiritomadaberuwo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd110e993---tapoxilipere.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/70131255423.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_off00013f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15785 10760 bytes
SHA-256: de870ea290166cd21da1a302ddb1189f9d1c300169c9f82b3ad1a153a410737d
font_02_sfnt_off00017056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17056 19636 bytes
SHA-256: 9d8bec9de6cd7d0819f11f2072f5ee6130826f19e02d05c4c5d09d9be0d94d95

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