Malicious PDF — malware analysis report

Static analysis result for SHA-256 5888d9406f1fdb6a…

MALICIOUS

PDF

92.3 KB Created: 2021-08-01 22:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84ed73e9fa42ed1ffee812a5c7fc0442 SHA-1: bcdcd99d2ccc8fee85c2a8e8846402f415fbfaac SHA-256: 5888d9406f1fdb6a9d1a815e6af85b3edaf4ee17d5a3300b7e591ef5c14e2d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://garglob.ru/uplcv?utm_term=soneto+clxvi+mientras+por+competir+con+tu+cabello+an%C3%A1lisis PDF link annotation
    • http://waelfawzy.com/userfiles/file/jolomeje.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/367f379d801e6ebaaa31ea18e093ec40/sibane.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42a7a178f---gatibivelobezidebun.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/kataxokuwemaforanuj.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/mafinivawodexugekebibos.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/038u23po5eos8pvlpt7olugmr9/19191377014.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/wusomegupotagalixoviwur.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/cee5e2d75546a990cda5e7e04d098b34/rulibof.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/78429539346.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9590789a4---51945560630.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40876665435.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/79ee593854c87fa99ad474f7e1f1b28e/nibumo.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gamujajevijanuzupon.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5337380a---gobilan.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/bonusozamile.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b579ca5d---gavunizipitafogigev.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/posix.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0704644001623844081.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/vufunazinogojedavasa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160843a45bbae1---3045776714.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/32264705092.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b6a5dbfd5---fevoxuwapemugewak.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/15b21b35f0c644e0a6dfbd9f2e0c9d42/zaxizilafakebuvonig.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_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 11200 bytes
SHA-256: 2884f69105d6903fd250248cbfbd49f68dcee0338756043b075d2e54910c68d8
font_01_sfnt_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 17652 bytes
SHA-256: d141c47069e76ff2f24906ad84e710700f016e3699dfc809379b811c7a4b7d74
font_02_sfnt_off00014725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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