Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c813e78c03fcd8d…

MALICIOUS

PDF

102.1 KB Created: 2021-09-01 19:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86bf1f7448b1f93122eb39176cb1b976 SHA-1: ec0dd323062196e9d5b094f3fa531768fb189f9e SHA-256: 4c813e78c03fcd8d0fc1dc71a6e11b5e5cb2d817e9e45c274e00d7629c93a2ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pasarantogel2.com/contents//files/jamomijoxedadarapuwedav.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/bewirikujoso.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/dosulasagulexoz.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/wovubofose.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/99654664906.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/rarasotiwotadenodepi.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f435426a16a---jaguninujojifi.pdfIn PDF document text
    • http://dztechfin.com/upload/file///gupuzar.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/67955470555.pdfIn PDF document text
    • https://fasaac.org/temp//files/24118282090.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/navusiga.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b4996b4c4cc26b52de7b74acca118573/34616697394.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/68601349478.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d50ceb14c51f38536f5f583f7f71b234/48869700982.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730eb5538b7---vuvoxuvuninoporijudifag.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210816_156324E2E3CD1AA6.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/sefafokiwomarawaxibek.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b0b82aaed83f1ab581a51550ee10767/saguzivawaxuwubejevorosaf.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/6d5d93daafe2a7a71f35b21d8b244660/23923940853.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/62938175569.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099f25a0daf4---46696214837.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcdbbc0f59---94654496056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=multiple+personality+meaningPDF 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_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 19596 bytes
SHA-256: a8704fdffb0c60e0ab127cc2af39c3b9e496d5ba23d390518ffa1255036fd64d
font_01_sfnt_off0001588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A3 10800 bytes
SHA-256: 694926fe63137cc5c941f9ed89b6467129a961eb347e9c26606e00cb14088b67

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