Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d2bd8108c7cf2…

MALICIOUS

PDF

86.9 KB Created: 2021-07-28 05:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f43782b0c6dc44b14f7da744eccdb16b SHA-1: 543b7cf77e225fc5ca36aa43a97b652abe8825c6 SHA-256: 790d2bd8108c7cf2e06433d8d6afd3150c16edc9029df5790e0e019a20c548b9
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.ijdsir.com/ckfinder/userfiles/files/dujijatexolomowitonek.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/sedaga.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160948b06bc709---tigapajukuwaz.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/78456277440.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/42988640300.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e3fd7c0c0---dunosefamonafomubed.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/68129214972.pdfIn PDF document text
    • https://dm288.rs/slicice/file/86535882618.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qn5l9spkr0g9afi2gquu0ip6ep/96153906662.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a868d171e85---gomenolepusujizelol.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dcf742f072f797b1318a5e0436543ff9/raloworuz.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xudipixogases.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/45203240280.pdfIn PDF document text
    • https://altbuket.ru/files/pimitujewaxolugupimu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79ef2e681---96740416062.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/gapinawubi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cb0b6654716137274203d1456883f87a/gatedefegigusoref.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62184192565.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093a90c5ecb1---47424363904.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/92482efa0ba15aa2541af05327104e56/59186537588.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da92967e6---13639672348.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sdc4krg2c9r7d5tsvna0fh6jjv/24335521545.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/49151263711.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bafuwebusinowotajavotok.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/betirorutimuxigitep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+check+verizon+hotspot+usagePDF 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 11004 bytes
SHA-256: c194b0742e52b9e6c4f5f838bd5b1b631f5bc0aa69a94cff9fbe1a846c1b9d93
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 17192 bytes
SHA-256: 86ce8cd6f000659d6c9e50d55ecb85a9cb508224942bbd498829217fdca97899
font_02_sfnt_off00013538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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