Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76cee22097b2b20…

MALICIOUS

PDF

73.9 KB Created: 2021-07-02 09:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d32c4d5abf75fa2b7e9cae961db4f3e SHA-1: e64ae901a52a27139e7010a0071644881de1bcf4 SHA-256: b76cee22097b2b209571fa17073589279d8430a858e7dba8d220488bbf2f87c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, 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 document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=pittsburgh+automotive+trim+and+molding+tool+set
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c52d450dc1b462cc1b3913d0115e31ed/80207924908.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7e562216---voroxosovavefaduv.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7eb216ad---getivasanobutisuxasiwufi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o4pd7nj3oe08ag7r48ilikkhq7/guverilokagunususuladidel.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6d0a2903---84121644100.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/bukos.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b2ce611d3edc9b670aab97db0208b114/koragazopizan.pdf
    • https://bostoncake888.com/UserFiles/files/muximepulono.pdf
    • https://businessservicesuk.com/userfiles/file/24291783217.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/edh44janatvgk790im9h4s9s90/38734026700.pdf
    • http://etcad.net/np/upfile/file/sufip.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9f0ce0b8---98377655490.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jesiwisebakesosuf.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a243e586f1---wizudutiwajarof.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9fd1adec3---nazugefalixapiso.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e41eef25aa9e53dd0980acba0b191988/36851138762.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16097d902c6488---rizitagas.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa213ba162a---82573345326.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e56d8b90fbf8a11313458d4924d414c8/71847549223.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/069476970313eb7481a7c3e1e4efdfdd/83203049092.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abe76b5b1ab---tawozatosapuposo.pdf
    • http://annandale1963.com/clients/69704/File/52433300964.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd95055a5e---rebedorepipupog.pdf
    • 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_off0000be0b.bin
269ec51d3a716b749fbfa8998e88f7398b78da58e184407b04bf682cfaffabe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0B 16412 bytes
font_01_sfnt_off0000e8cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 16792 bytes
font_02_sfnt_off000100e4.bin
d5409930b6600a20d5c5d96b72bf02cd4d0c2d069c6ba247c9778322b68e5013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11000 bytes

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