Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fab9d02b7f9b4f…

MALICIOUS

PDF

74.5 KB Created: 2021-10-04 14:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9bc31fdcd06f5850c2422c45217100e8 SHA-1: ad44a405294cd15b735fe44b6e336f2aa408cdc4 SHA-256: c7fab9d02b7f9b4fd5ef6b1b29fe42bcf591542341fe75bc5ea35dc29025b3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://4998horo.gmmwireless.com/contents/files/65764195081.pdf In PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/43461452363.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/joredi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0jp2ri6rovn72t793j5efpkbmm/saxawowavemona.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/43848712142.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/wobodemebibu.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kibererul.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20211001_AC711D515E2AB0B1.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e382a11a5---84434462045.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/nugukivuv.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/46942421699.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/91854615731.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/23092322335.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/94755356490.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/22041031681.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0596b0c14fba1d4917cd6d8546d25e10/90030155118.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/todikefewomifod.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/19028610106.pdfIn PDF document text
    • https://mediaskills.rs/files/wifolivadutimik.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/78389552891.pdfIn PDF document text
    • http://12shio5.com/contents/files/leruni.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/mifosijarofudafeni.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615900128ef57---91278883546.pdfIn PDF document text
    • https://ppsu.cz/files/file/61206599660.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161437f7dde995---xawid.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/49943028920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=american+pageant+online+textbookPDF 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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 15492 bytes
SHA-256: c6baf93f7eb1420dc9b549a9009015e8677f3e06599cf47cc89d5214c1648d53
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 10864 bytes
SHA-256: 36f6194db1d8a23051c163124359781d20dbab532bce82473c6769de71a2af74
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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