Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d8c6c419f20cc7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45ec75ed4458169518599cd9a4553e6a SHA-1: 50d1f88915930a66e21d24d60ced6ddb03f516aa SHA-256: d4d8c6c419f20cc7c49ccf973ed9719ff5d62bc1f0054d9c073badb2e8fca2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6cc4da2c---42501027696.pdf In PDF document text
    • http://sibinetweek.ru/userfiles/file/sajadapigerax.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0eb43060---83551559024.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/70075116789.pdfIn PDF document text
    • http://recviem.ru/img/upload/galupagaliro.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/nofufukujanom.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061252407483.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lamiwom.pdfIn PDF document text
    • http://hk-keber.de/images/file/vavizevare.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/77082048181.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/wepiwenadatisu.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/78138670326.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31288070013.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/waduwokozaj.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/xufosir.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317c472a66b---dekerikades.pdfIn PDF document text
    • https://granitnet.hu/editor_up/vugubugafunojub.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ok2j5sve24cdiuhlbuonmpochj/13934615836.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/dibakagamodogipa.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/94585940283.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64164569527.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/56011151249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=precalculus+glencoe+pdfPDF 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_off0000bee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 10708 bytes
SHA-256: 24545cc7f5012c64503259ec005106e2a902ae8095f460263497dfcda22ad093
font_01_sfnt_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 17268 bytes
SHA-256: 917e68dfa7d5729a340dfe02436f91727dcec99848d9ddd7a62e98cd3a97dda8
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1