Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e73bd26834641ba…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 14:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a1c0f2977dd7d83c601f0f9d268d056 SHA-1: 384e168c3f392c0d4695269f375243454694a6f0 SHA-256: 5e73bd26834641ba24f08c67788417d8f924e8919dcfd52f008eaf895813d9a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malicious files disguised as cracked software. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple URLs hosted on potentially disposable domains reinforces the phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a48a40d7---54187452441.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/eb96953dca29cc33a45c18265d1101eb/54162940261.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/wigopokil.pdfIn PDF document text
    • http://e-hematologica.com/users/file/34764855267.pdfIn PDF document text
    • http://delve-cr.com/uploads/totedolusebavofi.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/41473692968.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/guzedusazagosujinizas.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/xajovadamepokuwaxogovikum.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/98596345116.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e048acbec---nadetukisigetabubudetime.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/27cc02e65d22d7e587ee5012e80602c1/diturope.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/3174617432.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/razukubezufonakateweza.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/94592547927.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/55c2e32488c2d998f8418c54d1f02056/renazenugepomat.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/xerijugipizoxum.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a7d32fd2ec8d458bba07f922cdbe599c/vupilobobopotuzotobumixij.pdfIn PDF document text
    • https://novsport.com/content/File/wusofanubirarizuronegoloj.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ramuw.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7731165ca---13193234779.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/58999082671.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/19344110834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=es+file+explorer+cracked+apkPDF 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_off0000ae7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7F 15472 bytes
SHA-256: c4deaebad078629542d24e1793a7b6fb8118bd1990dc396e7f636b6d968519c2
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 10588 bytes
SHA-256: aa5647b1568be7e2894346cf4c4238c393b696bc8406dadcfd478fe2e8368fab
font_02_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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