Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0dcd01476afca1…

MALICIOUS

PDF

97.2 KB Created: 2021-09-08 12:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fb0343bc85f8901aa8fd597cf7b85626 SHA-1: f46cb1d7e9393a90093955c468a75c22878c238e SHA-256: 8f0dcd01476afca1a401ae5d5541b2e29abf662aea460f43c39c03fa59183c26
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/81222980944.pdf In PDF document text
    • https://behagi.eus/files/galeria/files/xupufugu.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/69524777683.pdfIn PDF document text
    • http://africareview.in/userfiles/file/duvimabiperopabi.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/nulagazivomipar.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/69862518673.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26eccd5a1---niboberulepefipod.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/rorosuwoxawi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906151513989596.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/43890011129.pdfIn PDF document text
    • http://honda-vo.com/upload/file/fadexibagulupav.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zitegelogi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/680kv7vqh91ukc99712ituc2q7/setapajoxorelip.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/wafafegimubedarakefakow.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/bupobogadirotogugukezoko.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161369098aace7---wivap.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/4466298242.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/xefegupofilupe.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/vabijukapefijojarasumu.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fuvarikojunupelagiwipumas.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/66544290645.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1b75ba8baa1ae30854d6f7ea603d69f0/31789570095.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/63978167295.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/nobupo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130af1ae9b32---dematovaw.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf38993ff---92028990262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=actual+test+toeic+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 24828 bytes
SHA-256: 0d09ddb9b2c1e2c3847645849e1cc865c36a55cc6c3f6c63fd0b9ad887077b13
font_01_sfnt_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 10488 bytes
SHA-256: c8409420b5dd57b93ca0164a558b31381e212fbe7155a20faf30ad7a521e14b8
font_02_sfnt_off0001491b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off00015ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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