Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a0264d1e0f3353…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 02:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2303d6140e98e38dd267682cd295fb39 SHA-1: 96ce706b2a1aee7e71e0e9e356ee4441b5190e78 SHA-256: a7a0264d1e0f33532bb784bce6be2f8ad9afb858ea56be1d2c87a580ca4ea516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and UTM term redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/13f276a84bdc2be87cd66f0a869d9e85/detapogote.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed5c37f146---92481502681.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05c8eb0cef---89087852035.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/2417386830.pdfIn PDF document text
    • http://rsst77.ru/upload/files/bubuzig.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jarokuzogiwido.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f755104012---21520829607.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/56762475583.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/duxasobuzabusevowiw.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/ropinowosavexefifokes.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/32343657843.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vupudesefetizokenilowered.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160826340b7e53---veredewugobebofekeputavif.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/mebunazetowawodupos.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/rimusuxurasivetewizan.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90e723f045---16162711798.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c299135539a---tumunilefidajarabiramebu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7a2b8f28---xorovozunikamulepa.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/54366833574.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/31356720803.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tiwuvip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=honeywell+thermostat+manual+th8110r1008PDF 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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 17912 bytes
SHA-256: 9975cf436bb697a40299e8d287ff7ba39a6a6fd4759f046a2bd474a218adf85a
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 10952 bytes
SHA-256: 3e8f77b6b98ffd89f0acd7ab508aba3b6323259ed261f6aa6368c48680cdbb93

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