Malicious PDF — malware analysis report

Static analysis result for SHA-256 867f4e209394c215…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 12:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee1015ca761ad132d5009319d61e4216 SHA-1: 1fb678badb9dd0b34658cfc5997964f4ca0d411b SHA-256: 867f4e209394c215741b6c01e6c155953183788e919f5e70fcc58aa1c8aad50b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to compromised WordPress sites, suggesting it's used to distribute further malware or lead users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a658e7dc5f---76934150971.pdf In PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/neremunapadazufajiden.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/pudozapadazosulikuwobiv.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/menalikejasagimadikuv.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/nasekidabovawalekefasu.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/mikilotakogaguxib.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/difibupevutusitozab.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/niveperagasujawepi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vigesix.pdfIn PDF document text
    • http://mobil-tech.com/files/62904194582.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/ranavisokudubuwifu.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/63049281101.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/55575944675.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/66131105878.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/11546452430.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/v1gp75u9udp1l03p0c5supjfon/32415351875.pdfIn PDF document text
    • http://come2menorca.com/images/file/gapasevizok.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/90060606114.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/44892452259.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49a1d8633---jilimanej.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pofevo.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/pimux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+4+activation+lock+removal+toolPDF 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 10660 bytes
SHA-256: e232f2885e19ac017b94f44497cd44a1e23b904e00046a4dc8f27b3a32fc0f15
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 16988 bytes
SHA-256: dfcfc673024d118335dddbda55fcdf79edbafe7a10f744c3701751427377f213
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1