Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff1988036f39162…

MALICIOUS

PDF

95.8 KB Created: 2021-09-13 09:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fca1f32644e7002c9fa9edab8edceab1 SHA-1: 2209313819b4e1944a4e52cbceda13af554e1d49 SHA-256: bff1988036f391627909bbd50c360a15c49a601c7d0cd50969d400c6ebb57bd2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=list+of+olympian+gods+and+goddesses PDF link annotation
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/33589846483.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210903040224.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/xedovadoji.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/12386766687.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/86292812097.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/61604532832.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/37035913547.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nugamoberog.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/2925806334.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163072064649149731293.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909102035.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e07bd734---vasuvadutinebini.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/81863296842.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/99858707813.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/fojagifewoli.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130669854a63---warulak.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/96406022ed02724c65ae9c25206e360d/dinelibewafesapeduven.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/kogilovujafeniw.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/96666021081.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/rosajotad.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/71899666276.pdfIn PDF document text
    • https://fond.ru/userfiles/file/zalibirawipujarixonewelu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nakorefibonu.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/wefunabixufamo.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_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 20740 bytes
SHA-256: e8084ea3619dccee549393873ca8c203bd46ab1b1336cb657bfb11e3e8e50f55
font_01_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 10812 bytes
SHA-256: 90a247de9d048858f232794351604b444f8bc8544f5667279da35d677cc60e34
font_02_sfnt_off0001599a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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