Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf24de0e4f43dad…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 01:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 163f0ee8b857edc20465f728d467f3b2 SHA-1: 0570b48855cf6282d55b17745554bd5bd0f1a3b3 SHA-256: 5bf24de0e4f43dad128fb7bdaeb0f807796d275f7c92210b7d2a1c64d73cf337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the embedded URLs are the main indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/91817299183.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc14226188---8371410579.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b02b51adb---69289107976.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/kagusadeximugomo.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/13195830494.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/sevuf.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/kcbgm4apqqa14aip07gjsigfdi/mopafopagelupujabeku.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7r8f0ph1qcg53n47hukdtne7j5/79100436231.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/25407642411.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/50724195941.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mp1nml3h4skcdirvf3bjodtatl/jevirovimuvadeniruzazomo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5eafa12a8---78143774238.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/85050464484.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/37990975874.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/20795311362.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/53415463260.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9b64da1e3b4ee15090923d24ed5996ed/ripivugozidipogajutisoj.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/6650784420.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/59212960823.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/16191496426.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kubosobujaw.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/30504069123.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160868824d22f1---6590376130.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/49340722248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=orbitrek+cross+trainer+manualPDF 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_off0000bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 16036 bytes
SHA-256: 9151dfe24e016137628b901ec07fe3b597781dd2317e4ee7a59db8b7f0870b06
font_01_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 10748 bytes
SHA-256: 441551fa110768c6481f573a2e2660d0bf538a13c0343006dd7c135eb053a17e
font_02_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1