Malicious PDF — malware analysis report

Static analysis result for SHA-256 246a1ab599044570…

MALICIOUS

PDF

77.0 KB Created: 2021-07-14 01:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 100a2a24d2fbd1f5125a74a5ca67541c SHA-1: 7b799ee8c47213fcf078f69d566d476d3199edbc SHA-256: 246a1ab599044570710d19f6c8351e85aefe9219fc1776effafcda7f8f820fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous URLs pointing to compromised CMS uploads. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://steklo-shik.ru/userfiles/file/92225505977.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c0drvaq8sel38pd4gf28t9mc9a/xexukapibujafis.pdf
    • http://nfc-lampang.com/user_img/files/31825265943.pdf
    • http://giadinhlaurenso.org/upload/files/29259046065.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d28e1fe43c5---zoxor.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91556f7f0d85d9eeaf917bfc1689748b/67297409983.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fd18f94284bf8d9898cb63ea7af8cb7b/99670460480.pdf
    • http://biirbeh.mn/images/content/file/5759484170.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c30888dd7c41b3f680f50170b6f7ae06/1048103937.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p2lf3b79olooek86p802tbd543/zewus.pdf
    • http://labotinnghia.com/img/files/fusuluxi.pdf
    • http://primaneighbors.com/userimages/fulekelarabeja.pdf
    • http://chochosanencino.com/uploads/files/sigoza.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcd4893cb0---sazatilanigeb.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5bd288973326c70b0d21c8729aade0c8/33582064969.pdf
    • https://kovtec.pl/eurostyl/photos/file/79476252320.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98208c14a5---49323625322.pdf
    • http://doreenindiatours.com/userfiles/file/tamududixazokuxato.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/46101603606.pdf
    • http://acecaalcoy.com/userfiles/file/ruwobamufu.pdf
    • http://qqsbg.net/uploads/file/migasozovelaxopuvafe.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/h76eir14tkb2qsqbou8aka0t4q/8584945046.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/bexujiputewo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ced803a6574265e973f630454c198bae/44624808808.pdf
    • https://liderpin.com/calisma2/files/uploads/xerezagofulad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=background+foto+studio+png
    • 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_off0000cbd1.bin
77cb45c6d90ce24dae973040ad68efde42933d3f98e333e46ae0bb9bc990395a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 10860 bytes
font_01_sfnt_off0000e4e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 16792 bytes
font_02_sfnt_off0000fcfa.bin
b8f2150cbfaec41db2995b84dc1de5a8d32920b9a1c828d79243b1e9bb47961e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 16132 bytes