Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cb89ffb44bfdba…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 00:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac21b986dca0ef2f4315eb42735132b0 SHA-1: 5072fbadaf7e244606aebfaf92114d69144029d5 SHA-256: 05cb89ffb44bfdbae747f701e55427092354e00c01fecb1b525c409b9ac294ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of embedded URLs point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://archism.ru/uplcv?utm_term=febrile+infection+related+epilepsy+syndrome PDF link annotation
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/78575d9f2684b00d1d36a8e923a28ed8/37402678847.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/zozabigurer.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b61bcacdb---vesonevafeliwegerowu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adffec9ffe0---46697627149.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c464dfe6---935405555.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041c8ce1112---1612565960.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491912bb6f---91668889948.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/37717894154.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/tukuxewepas.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b327fdaca45---zukarubexonom.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/68244655624.pdfIn PDF document text
    • https://tdfstore.it/file/giberepetekale.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e8a38c137---11776595705.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/60319091629.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8d9c80ec0---femavuwijowoxo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095620ae343d---55820029375.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/538153d5a59ffa75e94131e36dbe2784/zuvuzufesakivopumoredowi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5e3091f2---71357632110.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/31738189076.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/jemefuli.pdfIn PDF document text
    • http://freeski.hu/freeski/file/nijuliloleraxivodezugefu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af8bf7ac8b94fdb412d2da36e94dd5fb/gukudoxirenemafe.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/venirokupefazub.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/2712859172.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/99bf5b4a9f103f2023f4724f2db1a5f7/24861970781.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160865c9d3766c---99198900038.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/401ad2fd63e296391f0fa2912fd91ab8/pizejoba.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/favisiv.pdfIn PDF document text
    • https://medlineplus.gov/genetics/condition/genetic-epilepsy-with-febilile-sizuss-pIn 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_off0000c60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 11012 bytes
SHA-256: ace2395ac275d6e49d1d2a15a6015292ffbb5745d6c15a681f941de20e522645
font_02_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 15992 bytes
SHA-256: aeb3b9dd4641743fc6043a151d350e4ea69a6006f23bd8c9bc7efc4fe4601462

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