Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d0cb6720d83a63…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b16c4d9f0ff9352c420beaa9d1851aef SHA-1: 6a77ba935a5a71d42e8f070a48c6324a19d09fd8 SHA-256: f7d0cb6720d83a63ffc5f8b0d16cbd433dc88c3b9f6c1e47776894e3185ca874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The presence of multiple PDF link farm heuristics supports this assessment.

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://mosallaesf.ir/uploads/ck/files/32468526935.pdf In PDF document text
    • http://metabolitplus.ru/files/file/befikuligigozifeferidevi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160856b3b7d547---1673633182.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b0a8fd01519a27cac7c146c1472c7fc6/muliloza.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/39479205221.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/lofolizibeke.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/49321222381.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4b5eb469f2fb5bc119b9fd1d0d5e47cc/14794799981.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/618580870dabe56fa53b056e0deaf3b2/tuxiwegi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/eb228f4b7f6127c458e9db34ba646224/21879191190.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/89395cebbb93e77dc67567e4be5a1067/54738770824.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/80679441019.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/porivebatelajozerat.pdfIn PDF document text
    • https://schmitz.cz/res/file/rogis.pdfIn PDF document text
    • https://priscar.com/documents/files/jebifovobudigenu.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/felojokemasif.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7fc6c309---68876494983.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59440931564.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511797342c---fovozijukiwetuvak.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/madugezodi.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/5694214887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=antibiotic+resistance+poster+pdfPDF 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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 10688 bytes
SHA-256: 8a8a649db21b4b2c2e4d527a88c74c2aca992ffa2cff2fa40b8538178f16b280
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 17380 bytes
SHA-256: fbb75914e35911f5346bc0afa672c59dfab0c3d0db3b245f04886fd4016849f9

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