Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c8eb0acfa8db81…

MALICIOUS

PDF

82.6 KB Created: 2021-08-20 15:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 01f992eef2d5a5b028653e223cd085c8 SHA-1: 432c2fbc13d3c407b052f1d66a9bcc2e317a8c69 SHA-256: 08c8eb0acfa8db818b2444617e5d3bfb953b567c97655554645fcfabfb2f0056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23f4bef55---49033874988.pdf In PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/79598445345.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c304b187a---kokadaxadipijabazipus.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/jiliwa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tri5spd4tg5kdpq9hmrodipe54/kerebivuzosatibakozegimon.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0hug91mps3h9ruc3bg3coicuf/pidemex.pdfIn PDF document text
    • https://elektrona.cz/files/file/27617761654.pdfIn PDF document text
    • http://usateatop.com/_upload/files/88775561025.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/ruwov.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24326948dc---bisokawuzilezuw.pdfIn PDF document text
    • http://liyangah.com/Upload/file/70438499009.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/mobodit.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/49536776820.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/puxawizutukevufexusovavup.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b693787e1a---posedevobowemusisi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608524e2dde73---28170384896.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f545106528da18ac574d40add65e193d.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/13b8b07f0252df7f61a3a13da5433c02/vurovetuno.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010a29670a0---57381987930.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088966c924aa---vutirilafom.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/tewodaj.pdfIn PDF document text
    • http://ippon.lv/uploads/File/namizavijeronukozidafav.pdfIn PDF document text
    • http://sciattella.net/images/file/gunisejexam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jurassic+survival+island+dinosaur+and+craft+mod+apk+android+1PDF 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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 19984 bytes
SHA-256: e67756694f1af81cd96972de7b4d14ae78e3a3d82d17b1e81305dafba706709c
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 10952 bytes
SHA-256: 00dcf62daa5775926cdca3de301aae9ec3eba6715e90b23e70903cd4a1aa141f
font_02_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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