Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf28216de3ad05…

MALICIOUS

PDF

106.1 KB Created: 2021-07-31 01:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e33650c5dd822e9d412682fac11197f7 SHA-1: 966b825db94a67b7569e6f3d002895b82184319b SHA-256: a9cf28216de3ad05d1f72607ac108716da618fd6e268dac9fcde6ffedf6752c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55ce97723---35841565643.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e344995fe7---36613866265.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/69765475913.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/02a256dd4e211c12ca2b1c404c23284a/57324421355.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9ca168f57---79865519203.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f1ec7f3dcabab5a26fd7cff1ea435521/boladivaponasabobi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/39597969914.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00a4c7d822---8103398577.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/runexagekojitavepekiv.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e53db5602---viredasirutow.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6c678570---mavakuruporuwapebojudi.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/bojujovomapivepasamasot.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/12916961062.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/96776593323.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/57778257486.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/17669909727.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/zevalizemisagozoroxeb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886fe544a1e---30350446248.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/85417210719.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kolos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=upstream+elementary+a2+teacher%27s+book+pdf+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8CPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 22480 bytes
SHA-256: 5fff9648c6a6173d52860f6d4f58cee7a3e138a42c1283136f340738fd6f065b
font_02_sfnt_off00016490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16490 7040 bytes
SHA-256: ec63d19d5a457cc7d9c89de4ac0707e8481e0f2a870a65b60995376f999b9a07
font_03_sfnt_off00017c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C23 11940 bytes
SHA-256: 1d7557605008d40a50b9e824552a3cc2dc8b3b5f7c8973b7b3f0be064c3a2bb9

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