Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d0e5e0f880e2ba…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 13:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40be1e71e184150e67948ad89641bf90 SHA-1: 4c7d353cf9ff81bba0a300f863f3b9ce1ef102b1 SHA-256: a3d0e5e0f880e2baff446c6b12cf6efcfe61bffc538045a91d8606cd2adef252
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs points to an attack pattern focused on external resource delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=iron+age+facts PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ojmg91j573mc0vjrrkn0gbq8g4/gegasomomikilu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/47305853142.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6uu11k0o55l26rqp91oco5o2l9/vexitazusalutox.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/jewopexoviwobaxez.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210620145116.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608548d5302da---48768070364.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/95381482954.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff164af89b---96937978592.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fgtc1mi09gal1d3h1okvskikl2/74887025013.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/936799254.pdfIn PDF document text
    • http://bscartridge.com/pic/28708624053.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/288db9b346523ee5e75d173a1fb5e039/66572053566.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607699b4baaa8---lozusebefunanisu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075081a9b330---49654186206.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/44042511968.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c51a6f286c33547fd4c4130d10ee9f/xasijodopovewapaxojop.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d6dc8ea36a5d6b1532fee07d2f972d8e/6423509381.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf12e2e034a---94006146481.pdfIn PDF document text
    • https://energooptima.hu/upload/File/36874651650.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/kadulapu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/678bea6fcd8c8d4628354cba8c0c3a55/fogasirumir.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/28966183874.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tivnhfjicp0je7b17bmnvl6ie3/10296919519.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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10324 bytes
SHA-256: 425a9b8258a375b7baa6d523b5ea361aa4740c2b46efd66ed9fa74a90f512039
font_01_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 16804 bytes
SHA-256: 725e48a8027eff9ad0bd17aa337894c5243325d932aa3eefe686d095778b88b4
font_02_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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