Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b9c3773048fc1d…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 20:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35ae615286a4781c4b6f633864d5d6fa SHA-1: f8a9d9090f49488a63b1c5a1ff7c466d8e52a4c9 SHA-256: 20b9c3773048fc1d7566642eb7842ad584208d3713b306e1214f9c5fba22fb07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=tipos+de+pinzas+quirurgicas+pdf PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b71bc6384d---12033492931.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121aaa5b85c9---57906471621.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/berewubevapo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/83622931771.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/44778831686.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/buzojasip.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5c52e5fe---68885817565.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/48852952719.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/96241842964.pdfIn PDF document text
    • http://air-ned.com/uploads/files/daxoposomo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f86b236d---soxilupozubedag.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nikaxadoboboxadisidibuxu.pdfIn PDF document text
    • http://elskenecologie.nl/files/35762546659.pdfIn PDF document text
    • http://palami.by/images/file/manodokenijevanudolefunep.pdfIn PDF document text
    • http://www.pilartangguh.com/file/11721672387.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/vanar.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tavadotunijabemadufi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ki2thn69e7brgv4o20mjumfkbf/kofixubofubidegujuzixabi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bbc4cd5678788b9889cc2ae47d74cb49/pavijaw.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/xagijabetamewaxu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608118ba9c3dd---62345887035.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/wurixasarinudapipogiguj.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/06d058655e5c6544425bfc5a83304113/50215157393.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/dovisepowowovikixov.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_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10920 bytes
SHA-256: 5a16cf6d7005e81fad645762212598849630224e4541eb66c6ab898b37b004e3
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 19760 bytes
SHA-256: 4b92391b826c32388535855cea5e45da2f7749a689ca6303fba80fc5ebe3316a

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