Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3f8e9fd79466ac…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 00:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d980dbc1623eaabfacd02b2ce24d23ed SHA-1: 15969374b99fa2de681fc8f7b083620b0bb507d7 SHA-256: 1c3f8e9fd79466ac1d0654da1c54ee3df67d80aeec787d705ddcb96345136fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://asja.ua/userfiles/file/lukenawovogilajimigenepe.pdf In PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/22844592561.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/26376884094.pdfIn PDF document text
    • https://tavio.ru/files/file/nagetuwejadumitusova.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/bejapumagowazesutivago.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f34f83187ac---paxaxo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pod4cbvf9cjdn0t67irt51jfs1/disubokajapawag.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vifexij.pdfIn PDF document text
    • http://rsst77.ru/upload/files/xatigejipejiburisaxural.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/pifarewogusu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16118f647a19e0---fofalewegatuzumup.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/12737909133.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/71641335115.pdfIn PDF document text
    • https://led7.ru/file/fafikemalagufapama.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9707385c15---mobedotelozupuwatedinave.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/27610292811.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f4664f817---8455733309.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021083022341049.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bdcd1c29d70a3192e69c6421179320ad/56956393604.pdfIn PDF document text
    • http://sun-tes.ru/files/file/45207565125.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/mafutifepazosofo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720f6478a2---rukisujilofatoligotijadi.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/96876997233.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f602c063153f317b1283a7fbd9ff43e2/4237978347.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9faa602e8d---voruvirosobuxawujeni.pdfIn PDF document text
    • http://sdds.be/userfiles/file/bugasoxagedizotukojir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=toy+story+4+a113PDF 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_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 18676 bytes
SHA-256: 65fb88065b6dd0fe017b6355ad5e35f26b4705f456ec8b336bbfe472d93d646a
font_01_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 10108 bytes
SHA-256: 44024496dc398c36888fab148c2590227aea1cfa96d4d1645b71b25344a2b7d2
font_02_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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