Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5e8fa9f689fada…

MALICIOUS

PDF

86.6 KB Created: 2021-09-21 06:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5b6ab897e5376aef8f66e031d0158d5 SHA-1: 9f4c83816448f712a33263ebe51bee5bb4b640ac SHA-256: da5e8fa9f689fadabdcbbf87af42510ccc53627e0f474c2dcdbbdb9d28beef31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.siposferenc.hu/html/xuber.pdf In PDF document text
    • http://dongshengcable.com/images/upload/File/19999052197.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/87806192042.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/tigonepagow.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/kavejunaxo.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/jezagogasapevemixukol.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/nofitixusib.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/31201800242.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/55784624883.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/95724462979.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/2988296798.pdfIn PDF document text
    • https://unaizahic.com/Files/files/xidiravasilalobigi.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pobad.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/012873bc828c97073e0b2e865be43287/71036139070.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/jomavefisu.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/wolituzufiw.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/tawevewetobopaforot.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k5qrdem3k44r3cndto1ujgjhm6/91859981070.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/finup.pdfIn PDF document text
    • https://pixel.bg/img/file/65972915028.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/dusofojakemoxowukawo.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/87991679079.pdfIn PDF document text
    • http://sjanzee.nl/file/lorizupisek.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/netikubino.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130afed20713---94885536649.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/masofelumunejoja.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/81444606888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=connect+my+phone+to+android+autoPDF 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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 17768 bytes
SHA-256: 743179b1bfcd5563eb22c6ad996fa40dcca76550129e01cc16203fe096576410
font_01_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 10808 bytes
SHA-256: 5d81e0738d209c58c43fe0df02fd829055474ef182ae7f9b8b62cf17407e1751
font_02_sfnt_off00013419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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