Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73346243c2f91bc…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 19:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c09f5336634065f052dbf9aba66fbe9e SHA-1: 0cb5d5941a66bcedb6b70f7316e4f4b24bab13e6 SHA-256: c73346243c2f91bc6de628ce78cfac5ba121a2843d8f056db9df7143cdfff104
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, is consistent with the lure described by the SE_ADVANCE_FEE_SCAM_LURE heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cf570d0c07666103b52d44340bb71930/22191567804.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094d577e6672---vozapisulax.pdf
    • http://eksan-ltd.com/userfiles/file/2991537154.pdf
    • http://shengnabei.com/uploadfile/file///2021062406285837.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/47016554406.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7666801c83---reduzetit.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b99070567ca---77928777182.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/47567289561.pdf
    • http://braciszewska-klimek.pl/fck_files/file/milisanofusap.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/ralobip.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/41659724890.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b430db7c810---dekavixo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a4ec689140b2ef45ed7ec045a848f67c/9985612177.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/38060728345.pdf
    • http://topas.lt/userfiles/file/79218488592.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/af260b96ec67f32fedd8abba6f6130ec/55212785640.pdf
    • http://alwaditrading.com/userfiles/files/66346523906.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8505f90d---17862843209.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11011660db---25449139049.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c3117d9ae38772796582a39860a65e55/mofas.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jdjnebpblog0itekofv2m277u3/rawalaro.pdf
    • https://anakmeong.com/contents//files/40233710383.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=will+the+price+of+houses+go+down+in+2020
    • 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_off0000fac6.bin
ac60acb1832042c3fe0ddd83f511a82fc3a3251bd9dcdc26fa93e7df16bc9a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16496 bytes
font_01_sfnt_off000125c7.bin
3b2bfe7d7fc947a7458bb6de5a73248ddc2f163bc4c9fbb5f0c774fe58393031
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 11156 bytes
font_02_sfnt_off00013faf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAF 16792 bytes