Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb9ac02f6ec874f…

MALICIOUS

PDF

90.9 KB Created: 2021-07-02 08:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01d77510c5bbf9d0ee599288c4723a7b SHA-1: 6112a102b6bf4007276864c886f4619f2c8cd7e4 SHA-256: 2fb9ac02f6ec874f43531515a5cc8d6ba413d14f08649a61115f08303c3f0d95
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://champagne-marc-chauvet.com/images/files/folaziputeloxeritux.pdf In PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/zunal.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/gagewamojosujuzala.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0ddd5cb---visowawigosozaliluxozufiz.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1e89c53b9c74e804630c19eb28650627/10004912588.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/bipegapedoxinuteva.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d30b0a45c1571a2a2265d6e67cc850fe/nogogiz.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/bilovovimokomoguwovo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3bead7cdda3427836af8c6b9258a311e/lumanir.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/nepugutinegowabinika.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077cab516d96---sojijuwagunuloz.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/78716877223.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/42031018468.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/34304971681.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///wopatadokeg.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/dj9bedh1jaq8jlvk86g6pjd20g/21968636596.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/73q3vdsuj23ouiv2tsrhgikblo/18782784158.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24cdaaafa1---65412828890.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609029a075771---19582737403.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/pokuwabetet.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e576c247ce8a6da19087ac3e90dd8162/97940183054.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/livobuwokakokowuba.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e82abe1362c3aa8983082c8a558ce8cc/fuxaratafedawagudowoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=leche+flan+without+evaporated+milkPDF 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_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 11016 bytes
SHA-256: 9d573460e3b9febd84edd729e53103198f48bec5b03b79c456526db4275cf27c
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 18216 bytes
SHA-256: c5ce5bb0c6b14a7352db1c67a5852f1db7541c9708474c6f05df204af639ce60