Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e296df18ba9c85…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 13:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5dcacc15169f21995e1446d272d95ae3 SHA-1: cbe6499e7c86326eb667f8eb7f75c579ed909a77 SHA-256: 22e296df18ba9c852cf1725c9176aadf04489483db65461dad349a2a344758c1
156 Risk Score

Malware Insights

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

The PDF was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265dee10df---87514674184.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb3cbba13---20219802987.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/rejinebiwurisoruterafifa.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/xixujudekojafekeme.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9211453a1c---32412099895.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/67087282995.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0peq12vq8cbsce2ei59f5a8csc/fasakafo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/bugudojasowid.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/37468030231.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2c49a976b7fc77ddc8cc7571e930eb96/27916840757.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/20265131578.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/lesizazo.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/tebagiloxudojowumebaguze.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ed5lbr555hbaqplhb0bcd3g8hb/75776504451.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/jumakoruwazarikovumi.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/tezufenirurovolowexatis.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/danatekorogezekituwo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6038aa99972cbdd6777077a68c8e95b8/73086707788.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/xukesivegagufiwivem.pdfIn PDF document text
    • http://infunplastic.com/d/files/nedonajagopiboso.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a510d415e43---25839839597.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025275e7cb---83199942831.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/66854021952.pdfIn PDF document text
    • https://numberonerevolution.it/file/kuvajizezagulisageb.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160811b9bc5011---nogipunamapavizeja.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/puvikepomirusorixeji.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7bdd096c1---39595143806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dedicated+to+meaningPDF 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_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 10400 bytes
SHA-256: 299690bc1812cf4ec91faa77d0ed32f57b8eb91467df3f230f71d4391f4186f8
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 17164 bytes
SHA-256: 7e65d212798bb5a64df2af5953818586bb2d744555c022db111cc3d6d9764156
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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