Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a24fc20b6f3ef4f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 21:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 54d8a636185fc973976794bb09ab174c SHA-1: a79036537a8a35725569f213c9bcac419d921dc3 SHA-256: 1a24fc20b6f3ef4f8c7b2506a4fca6654ee19315031bf9c63d0138ae9abab12c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

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://altelaw.com/uploads/image/file/furitigepulom.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/dujesajozenedukazirodafo.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210628071022.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47a61c03fe---biwirobavovaregem.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedf0c37588---jugasopulaku.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c5601299cf5048a8e48982a46a389430/tevujupanoludo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f9bb3d6---xaxugo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/ruvedibegezurasapudevuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b99704019---91863386506.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/tesiwedabakonunixekipubu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c255919e---jejosememubuxogenetariwa.pdfIn PDF document text
    • http://babamoleskine.com/files/file/4142453880.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719c5176543---vibijisozewugoloxobi.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xanetopopevejuzize.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608defc93a8c9---mazikoninojijus.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e92e7e31bc0---kulenumupunolitep.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080fcc18d450---19337288889.pdfIn PDF document text
    • http://ibb-online.ru/f/file/2631706906.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/witozafuzopipofubenevafe.pdfIn PDF document text
    • http://come2menorca.com/images/file/tixarigoko.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7eb349b68a3f6af5d6455ebb87fbebdb/forikufugiso.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wakobatupovifikuviwexof.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/65688306271.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o302v8jgg67bgj1nhktcne9ha1/xiduruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+perfect+order+to+watch+marvel+moviesPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/87524465572.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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10896 bytes
SHA-256: 5f4d5675b26e39ec4e2f645472f7185ab0314063a93a7d5d8ab7c7dab0d1cd9a
font_01_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 17284 bytes
SHA-256: b4c6a66dcf230b01161008bad48a08aad2ef495677d4fe2a9704086dd63e514c
font_02_sfnt_off000140e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1