Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71f9c5f779ed854…

MALICIOUS

PDF

95.2 KB Created: 2021-07-31 07:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e45f46fa3512469b6f530f59232c3461 SHA-1: f01c0cd6894658e9ade20c0fa64d83cfcd379708 SHA-256: b71f9c5f779ed8546be42fcac199cd4505d85e23ce5960a4cc52991c74816ebf
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://ashole.hu/UserFiles/File/54901752850.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b7779963---tefapurovefe.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ea74509cd92e29bde4678a67d3c0042b/13498945683.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a96c9061e0f---tixoz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b333bf52---68322456336.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/c3757u7uha7rr8k8ifk5g4mefi/fumexujakisikufini.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032ac038a5---7297382456.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/04f18c5526d96cc33827561a18403d00/76875262015.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b2661f0a9---46997253730.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/p1usmgiq3ius17p82ngpo1puu8/14522887438.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88567e86fc3a054179098abf2a4a0b9d/guteforewaxavipurowe.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085101dd8014---72357344895.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d6120a84---7698259797.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607729a0d0b40---86764979461.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4db4626ce8---fovepitasabipose.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/20300268308.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/36618822061.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lm0b29vl2s1g8gjhqb9s9ptme3/89167394881.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/nemiwosuvexodipedonewi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/765fb6f36c260a0b05cf27530f8959bc/63690561238.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2808d97c---73300370325.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/be51c51aedd72bfec9be899a8b21675c/dojeb.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/14317864221.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/sfrb1mfj7it1tkm99rpq8roovs/joronuxubawafowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rick+roll+link+generatorPDF 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
stream_003_off0000f04b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF04B 20284 bytes
SHA-256: 8994bb83c916580f3e7638906a566afb1506fc187f994441894290709c3b3e8d
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 17172 bytes
SHA-256: 9b44455e266cd54f928b111cda48999393b4a6f4526fddc566daef5725bb08a6
font_02_sfnt_off00013f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F15 10376 bytes
SHA-256: b51e7d6bd6e6bdbe3623ae0e7b7c4e7b7f8f21856dccb113fbe97f6d7f9d13dc
font_03_sfnt_off000156b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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