Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad30859b2d5e4aee…

MALICIOUS

PDF

80.8 KB Created: 2021-07-24 17:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db420e047eee9893de5956d2c2e6f5b5 SHA-1: f220f2c5ce1b940a71f39b5cd65681109395d078 SHA-256: ad30859b2d5e4aeef11b050127f0d670fb79567efe948556b53b1f3064985257
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into believing it is an invoice or payment request, likely to encourage them to click the malicious links. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://limoride.net/gallery/file/kekumupisomezisapet.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079d8cec4f---88835366779.pdf
    • https://hosvagyok.hu/userfiles/file/zagazabekopiz.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689becd7e7---sibowutaxenavadagofeme.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc2302d24---58698816726.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a90494b7f70dd1ec87e424cae2d2eb8c/zokedajuv.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aea91500---20231753400.pdf
    • http://mai-colle.jp/userfiles/file/55591759310.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d896b2f14---98796306511.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/80108ee4a5d2d658c689bd9b581c5b85/15809310140.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39e5b7a529---74854507167.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af899a4a7aada9d648cf5d702637e594/bekudobefekovuv.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/lowujawunapopasujun.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kg9g6i4net09a4p4g7hceliim6/39114456874.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/37874291580.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a189bf080569a503401a27b30be548a7/jawovo.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7e7494e8a2dbd13d609fea745cabf402/99395613314.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72c44cf917---sozadepu.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b14c8732---kitovaretesozirebalanob.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/foxazowitatu.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/60095582484.pdf
    • https://smartcirclegroup.com/userfiles/file/jejudabevefajulobejatigip.pdf
    • https://observatoire-omic.org/documents/file/40430434031.pdf
    • http://studiotecnicopinto.it/userfiles/files/nogibetinakafugoga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+a+fake+invoice
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d671.bin
92881c875fb2dd04a1029801677a0153258ecd4f705a675a8978237f0d4db8b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 17432 bytes
font_01_sfnt_off00010459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
font_02_sfnt_off00011c70.bin
931d15f8ce8ae9e6e7f10965cd7b2c2a0fe3051d5a02e8063f12ae8d720a3f18
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10432 bytes