Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd86837519f9410…

MALICIOUS

PDF

75.0 KB Created: 2021-10-13 18:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 719a5d420c3f7e071094d852487dfc28 SHA-1: 54ac33b8e84c3bc9f187e2552d3ae4ac2e587714 SHA-256: dbd86837519f9410fa2f931872fcf18881b7919599c90eaa1b2dd79a89622555
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://radecznica.pl/userfiles/file/zowolano.pdf In PDF document text
    • https://indiachristian.org/uploads/files/ligigamisogomot.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/vagosijo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/30022025493.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/roporatojupepikud.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8cae7867---51860260408.pdfIn PDF document text
    • https://medtek.vn/storage/file/wogumutowumukalofovesiber.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/55903889573.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/fanovuxa.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/18125227785.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/fufilixodotor.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/aa24577ff3d815edcb972d6c24ba9198/44943042944.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/gegatumore.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hp6pesvcu6nm6qd5se3fo0glif/65040775802.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/gaxibuzesokomizilalapubo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rudav.pdfIn PDF document text
    • http://friulanapanini.com/images/file/4675571161.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/ac60a4a5b09e8ef6964bfd1259fedfe9.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/90028469315.pdfIn PDF document text
    • http://isvpro.com/custom/files/3628246467.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=official+cpc+certification+study+guide+pdf+downloadPDF 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 11120 bytes
SHA-256: 18314e2ab75c75b337da3e1ef8cee4c896a755761b328b36b7f7998af4c68650
font_02_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 17212 bytes
SHA-256: 0674b54ce449958d01f4e9e550c8dcc70eaa22ccbca92a1e8bb8b181924a8db0