Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f873f31817ef095…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 06:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85cee9229203bb622f87c9f9def289f7 SHA-1: 24a2ef5b2b870068fca794c6b4b90b79051873e8 SHA-256: 6f873f31817ef095b197bdf2733c82d5ce61499c7680c6c846df63a577f29971
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The document's structure and the presence of numerous URLs indicate a link farm designed for SEO poisoning or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=ubuntu+bluetooth+android PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387d32571---13229959626.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kisesil.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dbda3d54669e5fc8ff2585bb8dd2ff8b/pozawivodatekejabe.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e85969db8---76972448760.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bcf72138---fegagekubonigomuvagerelo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/nijozebosebogefebemifugej.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/30575284195.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/nogatefidaxazadu.pdfIn PDF document text
    • https://kawanmto.com/contents/files/jibelenijudovupona.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/79556256478.pdfIn PDF document text
    • http://glassick.com/userfiles/file/memidugosezeboza.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/16405626390.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/rufumube.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/35650773518.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/bukorizetozafinazixivosux.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/12071441775.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/64525428565.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631139538.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/rimuwegerijese.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/50996622355.pdfIn PDF document text
    • http://humanlitech.com/files/files/turis.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/wameviwevegogij.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/49455086635.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/13790787867.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/xugofiz.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/24349936454.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_off0000b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 14080 bytes
SHA-256: eb3feb0f7e5d02aec24c9ca6aaaef439816837ae67f08ed1816ec0cd553f67a0
font_01_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 10424 bytes
SHA-256: 408e23e031ac6ddf138b6263474b62ff1bddb26f6b3e20e99344d81b61fc1fd5
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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