Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e36ee1f36cc282…

MALICIOUS

PDF

91.8 KB Created: 2021-07-20 08:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0f6fea0df76dad4a3ee5158317cacf57 SHA-1: 249e99b6e638ce46a2b7cd06e35d2814e124d5d4 SHA-256: 76e36ee1f36cc282ebbf7d399c5aed98622ae3c63ae9900f51ac148350f3b9ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9ad0a1d8d9eed3f9f4aad976662b14fe/pisezosekabitav.pdf In PDF document text
    • https://menu2uplus.com/images/file/rarekarovulefu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bh1pfcovj79a78us0gn6r8ib73/kasuxibawigubibojed.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/26652600829.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607872f2ccc24---gexokutobof.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e851052d---19350547796.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/27541985509.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/1198987260.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/fowatebesawujuvizaliz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/151r44lb9n92puqqgn6up0atfm/sawujifosodenokakaj.pdfIn PDF document text
    • https://sbufficio.it/file/55020541569.pdfIn PDF document text
    • http://agama-rc.com/upload/files/99678979023.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7408eec6edb0f1e8cc014dc2546db9d4/36873959822.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9330479c0---godowizaki.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/55906261307.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ebd84b59c4b46656fdbee1c45525340/fajajukogezi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c630f911211---8463005906.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70df718a7---46091512403.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6b0b03428bf3b8f2c39bc4824c735a0a/dezemapipazefof.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/keruvifedamatote.pdfIn PDF document text
    • http://i-dron.cz/data/file/fusekowozefaboxovexab.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8185dd9740d44be3bafffca8ca91d634/notarekavapoduxopaka.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/31700324112.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1d76725eba851ae6da7a8efb54749250/98822079556.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/18145621953.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2739b3e4---74550729857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=subway+surfers+mod+apk+android+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 11176 bytes
SHA-256: 04ec034967f69ba44a4f2b94f74e5e9536540b1987bf9fdb598c9b60ecde87cc
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 17744 bytes
SHA-256: 58cd3e1b312d20e8ed774aa81218e28a18800258a5c3fe5935494d64cd2e9059
font_02_sfnt_off000133d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE5 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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