Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bece2bb9ca87c91…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 02:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1dc89574fbf593087a099f08bd056606 SHA-1: 13344b8719745498cfea11f2e3acfee0f5ec8fc3 SHA-256: 8bece2bb9ca87c919527a0a012d56fe01b0ff6b88b9d4e050d4e5a22ae6f2bb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://chcial.ru/uplcv?utm_term=convert+radians+to+degrees+calculator PDF link annotation
    • http://gesundimjob.at/images/content/files/jofanuse.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/kokanum.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/52652832202.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/kikolojibasigefi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2f70ea9a826c82f7323124913b1aae8e/tixafuvilevona.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/92058839627.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce28749023---nasozada.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ba0b3e93---belizobidosari.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/60086955030.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/nadoxokisojikajaxasojurug.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/86734989486.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vutepejixofebotuzan.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vitiwige.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/vokukifufu.pdfIn PDF document text
    • http://isvpro.com/custom/files/45135030045.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/93647469449.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/3841058123.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631369284546488389.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/55733610172.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bddbe2ec---35753398285.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/redirokiwazikazev.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/64998146601.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/79cc4f24a10fedc240b5e467af951a2b/lewivemuzoxexu.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/waloxizagumisekadaje.pdfIn PDF document text
    • 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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 18176 bytes
SHA-256: dcd25bf3de74adeb6463d06e8c53359ba0fccf5b4091a66412bc4fed5ff812ed
font_02_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 10740 bytes
SHA-256: 591090671658609752b1c784073d91bf31121faba0b86626d07f73643c88a3ca

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