Malicious PDF — malware analysis report

Static analysis result for SHA-256 84334268bbfac85b…

MALICIOUS

PDF

99.7 KB Created: 2021-08-12 19:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c8dcbba75a17bf282f2b651303e31d0 SHA-1: 62c181daab62f2dabce8ac69505760bc9548806d SHA-256: 84334268bbfac85b88f6d73dfc4f040233003bc970d7a578782a168b99a09a25
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://chcial.ru/uplcv?utm_term=using+the+indirect+approach+the+bad+news+comes PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b0500876---lovumexevade.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060800213773.pdfIn PDF document text
    • https://europartner2.pl/uploads/kewovewujoxipiwi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/jh6ven79a72j0agbcibkr8r473/kudoteme.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/nanipanebikosojazose.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b2bec51d---wesamowoxevez.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/7371641594.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c6204c32---sanisoxuponifufuzugi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nb2u7irdokff3d3521l71leqh5/22158918967.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/17o0p5j4dv3e05bvokvhrs64l0/rolexino.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/93222529764.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8vrati6fshv0d0ao5khrnds1hu/tefujumidepedurajeden.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c6fd5638a5d---30062107953.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b13689e742d---82522857613.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0038cfc23---38516468103.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5988883c---41469145795.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6d189afe---vidaxi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/69963609589.pdfIn PDF document text
    • http://18554080.com/userfiles/file/mijaxo.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/sefatexafutuw.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/ruzumunojasanumilowime.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6997fc9630---4660552892.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b350709085b---pezalaxemeb.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_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 17572 bytes
SHA-256: f9b009cf17883dfa1dbd725130e65e189973b22f13dfffc8f3c456e5e9ec7a44
font_01_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 11148 bytes
SHA-256: 64392c0483e064d62a8048c9033af84403da4e61cbf098d4e65e07df29fcbf2a
font_02_sfnt_off00016879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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