Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ede41e71adf8f8…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 07:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ad2bcf7764a62d44038324859284977 SHA-1: 1a795b2500ccef0b2dd0992f5aab1149d8eef599 SHA-256: 91ede41e71adf8f85c2f2c3480e6fa0a4e14634255438dcb48729d85ff42391b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO manipulation or to distribute further payloads. No scripts were extracted, but the presence of multiple external URIs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/900c9646ac5c3cd0122f157b4342c5c9/66056552076.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/03357e3b4a0de93ca8d7e6b36889464d/98065665917.pdf
    • http://grawerlik.pl/userfiles/file/49348883975.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c59291a610b8b5fb251bff1a300c3b47/90788090754.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b51bdade4331c074d7e91de49eb05441/96483286272.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7b3c1899---60554020078.pdf
    • http://gsemilia.it/userfiles/files/dozijalinasotaxikenuv.pdf
    • https://matfreklam.com/calisma2/files/uploads/99749861855.pdf
    • https://geya99.com/ckfinder/userfiles/files/pawodalivanurinofug.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8da8c66ce---89560780620.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16119b73960a09---novomonefipujowenug.pdf
    • https://accidentmatters.com/ckfinder/userfiles/files/tafewinizofegol.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bf255bea5---66351682232.pdf
    • https://noithatkuongthinh.com/uploads/files/tomomilemuk.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fajj56be2kq72a9n12lgdukf5t/fiserajakalebob.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/18231fc62f75a1664cf89fffb71e9707/21095935511.pdf
    • http://nicosiacaffe.it/file/mulivopedamagugapejo.pdf
    • http://osteriadelcampanile.com/userfiles/files/zorupo.pdf
    • http://vtvxm.vn/userfiles/file/99769139328.pdf
    • http://telekommarketing.com/firme_data/files/doxosekevafax.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e54c143---talugugebif.pdf
    • http://kenshopvn.com/uploads/files/83047272411.pdf
    • http://traiteur-ribot.fr/userfiles/file/88454164588.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+free+booter+panel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9c.bin
f23d50ffa3d6c29e7c0889ad687131a558b27178e5fbae918527f7f95cadecd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 10452 bytes
font_01_sfnt_off0000e64c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 16792 bytes
font_02_sfnt_off0000fe5e.bin
ac0696b003f22ba3e5624e8f6174702cefcab23a406c46ce48fdebf707212e33
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17060 bytes