Malicious PDF — malware analysis report

Static analysis result for SHA-256 be09bc64af719832…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 12:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5fbb8bdb5eee7c54d821a58171f1f06 SHA-1: 4fe64b4d8c819539db74169737b521c810314eb4 SHA-256: be09bc64af719832987641b48d69735eb9e59c25622348d980f677a685a4bdde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves to obscure the ultimate destination and potentially improve search engine ranking for malicious content.

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
  • 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 http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f5c6af853b2bdeeabc99f6ad055fd9d1/54871541904.pdf In PDF document text
    • http://runhouchem.com/upload/files/rirojubozugukagav.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/85844449150.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/tovevizuzowarunubajax.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380db7cadc8---xitadilidizugu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c817u2622frvt9mj6j853ma2jm/328693542.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/26881343401.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/18928455740.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/mefoterixi.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/buzejuzabixadidaxola.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/duxurisogukiketoxijuko.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a29773b174---ridejo.pdfIn PDF document text
    • http://koutingchina.com/upload/files/90874626455.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/momuxodijokixozuminenawaz.pdfIn PDF document text
    • https://dafelia.com/files/75376661247.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/30938456271.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/gefoxarulapadubarofojo.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/bokiligizofuxiwevamap.pdfIn PDF document text
    • http://kustari.net/userfiles/file/25672307149.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/jareb.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/47764680035.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/64408400453.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/jefewodisomewujinujavavud.pdfIn PDF document text
    • http://gardatrans.com/content/Files/92492264588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=como+aumentar+a+resolu%C3%A7%C3%A3o+do+celular+androidPDF 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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 11128 bytes
SHA-256: f1066fd1c7a09eec16934c0e6a6786d5cc0e166e8a7facff357fadda19246706
font_01_sfnt_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 23188 bytes
SHA-256: 2df05d8cdf2ee599d9421cd2b21c550cc71efce846cf4ef87fdad5d2b52b323a
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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