Malicious PDF — malware analysis report

Static analysis result for SHA-256 12365ae2e7751ae6…

MALICIOUS

PDF

88.5 KB Created: 2021-07-16 06:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73a065be0e115179763f7048dc8c9348 SHA-1: c7bb7f09e3cc96fa8c31148e639fa2e91240ad59 SHA-256: 12365ae2e7751ae6a4e3516e9c1e5e7336005e2b042a48d51d96ff38e216d6c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=websites+to+watch+free+new+movies
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/54eb6f8e7793d13c3bc3d94daf07ca29/lamofuxiwir.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d583ed0a09---kokug.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3317e25ca1b6574a304fca24e688fc56/96245068804.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/894f4239c515b864e196b3c13cdaf2a3/vepikuxu.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f59868b80d077a7492feb310dbe2596a/99640433252.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a47aff891e7---nenefozobekaj.pdf
    • http://paoladebenedetti.eu/userfiles/files/18893658629.pdf
    • http://altinay-law.com/images/file/jugitixosozosonid.pdf
    • https://pestresolution.pt/site/upload/file/58667734585.pdf
    • http://nesemlak.com/test/images/uploads/files/47145488465.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vigikazafisixuxizizakafud.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6550e737bf---7411312123.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077648672b5c---45339618860.pdf
    • http://www.sport-konyv.hu/userfiles/file/4336322088.pdf
    • http://pensionpoint.cz/userfiles/files/bukadisi.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f08bf105a---sogunemofovisapo.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f9da7719---xotixizelakanosuvafo.pdf
    • https://securitegenerale.tn/userfiles/file/zimadagasaru.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607006bfd9da0---suximebe.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3497433933---16468915115.pdf
    • http://licausi.it/userfiles/files/soxorisup.pdf
    • https://cometsecurity.in/admin/userfiles/file/21470301349.pdf
    • http://blueyee.com/upload/file/120849211838.pdf
    • http://www.tekkoo.net/images/library/File/nupuvinijuwi.pdf
    • http://aucoindeshalles.fr/menu/file/kudifenom.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_off0000f83e.bin
5f96c3e683218d18b70f999670b40eb0601c62e7ecef19fcd007c960ba86e517
pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16728 bytes
font_01_sfnt_off000123c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 16792 bytes
font_02_sfnt_off00013bdb.bin
80f8ef7021a8a39d52e7b2153d01800845ce2734014b76c1a7bf70a426aa9c4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDB 10840 bytes