Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a796ee99b6494ff…

MALICIOUS

PDF

88.1 KB Created: 2021-08-16 16:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f423f148a913237d1dc4058eb0c17d4a SHA-1: beb41eb156cdab48f1e0e8b36fdee041276f4788 SHA-256: 6a796ee99b6494ff496c954194c8c121f6c50901e751b7d42382a1e8121c59ce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e9ce1727119902c7d559b00f2cc016ee/diwog.pdf
    • http://kipia-nn.ru/userfiles/file/goxutefoxi.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/taworazubewubajilu.pdf
    • http://gorsilawfirm.com/userfiles/file/10181966524.pdf
    • http://wonikqnc.com/upload/editor/file/1624468942.pdf
    • http://aisef.org/uploads/userfiles/file/file/fadel.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/rfs0iorso8iufl3usm3railk74/58322309903.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e903cc94c09---papulubalaranebevu.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe7bcb4e---2095184666.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/kaluxus.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/litidazoj.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c089e829616---dexizibu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6998caee27128960b36ca77c3450270a/61102202651.pdf
    • http://tavaszitura.eu/userfiles/files/fotunotozabiwosuwoloxab.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3714a2102e---46727743010.pdf
    • http://valaptop.com/ImagesVA/file/55964310484.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c7bbb60d---sopoja.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4dbb192df---buzulezijutomafalonuwa.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080f50cd83d6---kosedo.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7f9d06cb---wowogobubasigunopogex.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a969e708e61---durinedizesegebijitixafor.pdf
    • http://nextgenship.net/upload/file/20210803162797215685.pdf
    • http://aelma.com/sites/default/userfiles/file/58294472646.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f34a9ab9a441553724bbd848352bef1/bedelupedupiwiduta.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608134520f8ba---35231343554.pdf
    • https://newtech-utm.pl/userfiles/file/mafogurujulumonetara.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/es9c9o6qk6aiiisi38qem3pifr/finotutuxexokabepimif.pdf
    • http://alibabashipping.com/userfiles/file/59289593334.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=libro+de+matematicas+2+de+secundaria+contestado+2019+larousse
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 16792 bytes
font_01_sfnt_off0000fcfb.bin
2d4ee589cffa0cd5b5a3a42627a2b4ecc1bfe6d2496251f5e4c0c96f1aff1c5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 11188 bytes
font_02_sfnt_off00011730.bin
9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 1684 bytes
font_03_sfnt_off00011f28.bin
190ba494c1d66798b8952378deb42ace41dc528de541b02660e80195397482ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 18376 bytes