Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bc27a0eca001d5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-31 03:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69f0216c58ac6b635180e1cd515c26ae SHA-1: 5999df9b8d3714384515218016d4eca90178d454 SHA-256: 76bc27a0eca001d51f5f87a9dfaf62265065432dd558548940e84c98e20ae604
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for delivering malware or stealing credentials. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a dropper or phishing page. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://garglob.ru/uplcv?utm_term=html+css+javascript+reference+pdf PDF link annotation
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5iuib2q910hqm8bkus3bcatvpe/rimogujasuj.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g1quuu497hr7npmomn9k2kv1v4/zovebinakume.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38fda4fe8f---bubuvepuduposibebitop.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/28227471826.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/makivodexarawagasaguvalig.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6287e2d129---13490965526.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pafatamumibiparikivav.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e78f996---ladofukapaweposagixat.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/30454958102.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/34c42b353c278646076adb29f29f36ab/memasilumibas.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2cecd1b2f7b4205f3fceafe47a8305b7/xirisotidewabar.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/veteterebafi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-18/20210518144853536541.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/74700085146.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/19fed183da26a28710c1ce5a8e4b7a4c/8444519410.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec6457d9e---12731741422.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/9hkv07el1v79ftreesrbc1em72/sunomepujoxobekureven.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cebe29c8---noxeripimokozofedavuwuz.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/23f1c79d32a998522143a9462cc84806/malinexumorepidafu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8e1rqgk49a7ihp4su9srkk2n54/45334072589.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/25343704329.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/zekiliruradesifizu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dcfe17f80a754dd3a88a98ea69406d55/bukezituwuvusipisanidamo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b9a0a308---vibidijob.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 10848 bytes
SHA-256: 4ace4a6f35d14665099499403fe90edd7ef3776b397657f265d697e8072ed10d
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 17240 bytes
SHA-256: bc645e8179cad2b2bab7d3c06954759752091758894540b4055a25728d58a5a9

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