Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1b143bc49851fe…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 00:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf0aa554b6e2352ea19fb2d849889003 SHA-1: 82eda98bf0ef5c35718e4203551b7c9cd68f5965 SHA-256: 9c1b143bc49851fe97a6927fc0cbe577f14fc60c586b93142d8fdb47c6be0cff
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=siemens+euroset+5020+bedienungsanleitung+pdf PDF link annotation
    • http://maduraigarlandshop.com/userfiles/file/wivagoribexuzanadutop.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510db93535---45220518823.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/35315990581.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/61cb407115ec8f30a28fd69cc3a62c9f/kazuwudiwabinekulube.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/5mtd5fi4eup5c962r021avkl18/3981220195.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/87957796846.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/vujuxo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/16920635400.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502020547579542.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/78235515086.pdfIn PDF document text
    • http://odumakus.com/uploads/files/67220714818.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b98984dccee---gebexupifewig.pdfIn PDF document text
    • https://ikima.fr/uploads/file/duzasuxixubolipawibe.pdfIn PDF document text
    • http://erex.hu/upload/file/17686472549.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/t0ltn11jmtgapvrgbfaujjksl1/42090912728.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/woxelinibabizofine.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/rinimotetopilabut.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/94733531708.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940c781c0f7---fejenagimunofexonupisiwez.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc7982075b---pawuxekenetewuwomasuxufak.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/gebiramokuwofixonufomuved.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/89539582905.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/tokusupaxixezuwuza.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/45bd3ec5ec5b651aaacaba1f10b39166/taxafibusiteme.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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 11532 bytes
SHA-256: 307f40f26a0fff58099e46670bb61d9324b5145d6caa14ec3b774bc2e74ed16b
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 19828 bytes
SHA-256: 475a6863a23cabfd66d210e15ba3b0a93d9bc2a0121e08361ea1e0513f7fde93

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