Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f8a86820f1ff14…

MALICIOUS

PDF

80.1 KB Created: 2021-08-15 08:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3247c0ce70fab18a85facdf55d4bd2b9 SHA-1: 57b72c3a02d1684fc478ce3eb6d5c8286d668297 SHA-256: 99f8a86820f1ff147a09f66cbe9ea34bd651546cc2039c66d531b21ebdd0f8fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farms suggests an effort to obscure the true malicious destination and increase the chances of a successful download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6c029851f06a318219a23feaf910c291/xamerogidiridujifok.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160def045b74ee---penixetu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/narebuvilaritunenu.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/ziwakagife.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p4i2dc9i33acdjjjled687k4a3/nigamit.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/gawelaxedipururino.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/61489163636.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7264320246.pdfIn PDF document text
    • http://schubert-hh.de/image/file/xunorivevejikurele.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e28f23997---gitusowi.pdfIn PDF document text
    • https://norservis.cz/files/files/nijuniguzatut.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lasamadop.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c1a9f371---nuxonopedezeg.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/11910934074.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t47s6onrt479oaurjbek918r2g/jasejiperoleromar.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/173d3cf67a99d7530df76598cd2738df/fanazudepimaxudujab.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160999ba76542d---96137817113.pdfIn PDF document text
    • https://airbays.com/userfiles/file/folegalobulexutufijeravod.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/a317c623618fbd4846a1a97ae8907fbe/wureni.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef77a53482---89614913101.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/21356092567.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/64087390422.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dakeji.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/13950188596.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/zitopizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=castlevania+aria+of+sorrow+gba+rom+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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 11020 bytes
SHA-256: e86b6f0187cc69a653d2ef82001afaa123cd276e12d47e3d992fe0868830019d
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 18212 bytes
SHA-256: 9daf0f1e99463dc4db62c427d0cb0e9190300b6b7a40dea7553499ac94ebe61d

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