Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65eb0aa73c4056…

MALICIOUS

PDF

84.7 KB Created: 2021-07-19 08:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0582c165c0dbe1ee67dd6a9ddcb3bd08 SHA-1: 2e56e3fedad7c998cf2a1ef63fc68ba7260f9865 SHA-256: bc65eb0aa73c4056c4032f6f2bdf9085ee28376d920892d0a89a6fa3a9319a13
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to files hosted on compromised WordPress sites, likely to lure users into downloading further malicious content. The document's structure and the presence of multiple links on disposable or compromised hosting suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfbcfb1898---tubifurijat.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449e3e9784---fopomibepanubu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/pikedujixokog.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a10c822d9---13152302334.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/wunoxi.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tabewufekolenosovefu.pdfIn PDF document text
    • https://maturana.cl/upload/file/9329221846.pdfIn PDF document text
    • http://amajyuku.com/files/files/25591517891.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/da997f990b4176e02c50722a17669914/1797673654.pdfIn PDF document text
    • https://2acontractor.it/images/file/86650686075.pdfIn PDF document text
    • https://theurbanthinktank.com/files/mamotorod.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda06f4abf9---kukigajenebumuzeku.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/devavojuziginesamenipi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/wetekexowovusabipobo.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/pilopanozeduvubanemodabo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca1bb7aa1a---11447125627.pdfIn PDF document text
    • http://cortabellanews.com/userimages/visopuxemotonu.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8e40b1a60b1bacd8f9d14c33ea7576ee/59245894519.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1qsn4rch5t8cdsm1sbu4sush0q/40784327893.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/94232786160.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4ce7e4a891b19d88a7f14d63121e74e/87178428546.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/79634246335.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e9b1005f---88044146323.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bufudexu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf180b9069---91431752408.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7aa04d2d---visavupawiwe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40d28ac9a---16387942800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=liver+and+biliary+tractPDF 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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 16448 bytes
SHA-256: 6f01b07b50b051e748d47d50fd1481adce85b14d8856bacd6fa3c8b6efc8774a
font_01_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 10352 bytes
SHA-256: 3db4ca727f103493f7a68d94fd7eb654edffb43ee08274e28d79950b8442f3c2
font_02_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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