Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe0701f0d6b437e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 02:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c6bf8c857dad36bfc50406b09248f5f SHA-1: cc7f3f9e2ce2b97e629a02fcc27f8ef9ab7e35b1 SHA-256: dbe0701f0d6b437e93da862b9c88bb0a88c12675b178130947cfa7c55e06f7c4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The document body is unreadable, but the presence of numerous URLs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://heathrowairporttaxi.website/userfiles/file/95220261413.pdf In PDF document text
    • http://svaz-podnikani.cz/files/file/lebopugew.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/jeduvonisajisotupinegute.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/83870859431.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/781199587.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9a7f13f08ff43456f8913f576cbf81b3/jekewewusizilidegu.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/24559002966.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/disilutadibi.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/72933687806.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26450043808.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/36633794276.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/82066393866.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/rakezujemiwi.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/maguvarokek.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/41628750657.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4a1246bf9---dopegadefusafosur.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/8678226439.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/saduragakixixo.pdfIn PDF document text
    • https://digicpictures.com/downloads/61633462520.pdfIn PDF document text
    • http://nensi.si/upload/file/dazofixuganisodixeletigi.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/nibarebabisofamabo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b4a29b55ca1d92cffc62519e7b5db6ab/pesupabuxefesoserof.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/25146973359.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/sadogodabuvimefogoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=iphone+11+not+getting+text+messagesPDF 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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 17252 bytes
SHA-256: 90db03b2aa621bb0b459ea0ff85addd80ce3b58976342fbd6295bd23685c6143
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 10660 bytes
SHA-256: 3bef3e4c041b5cc6f59644423e768f88b119db9f6ce64356c92e9a7a714ca1ea

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