Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fced9cdc454c82…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 18:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65818135238cfba6510a1eda618375b6 SHA-1: 7955a280ae79d710c067f1432b447f0f42ac0622 SHA-256: 85fced9cdc454c8262a56f6f8c1f2405ac5d436adc4bc669682997c1b7f73635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on potentially compromised WordPress sites and disposable domains, disguised as legitimate reports. The presence of numerous external URIs and link farms suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nidi.mk/ckfinder/userfiles/files/nokakamezadorekati.pdf In PDF document text
    • http://chatfieldfarms101.com/userimages/nesudanejamivomijafuwutok.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/tumivogabudi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd9e47db4---34362718997.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212817a10a---85383285732.pdfIn PDF document text
    • http://ridendo.cz/files/file/vijinudasipumovu.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/tuzumuvuw.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/87748396718.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b458db86fc---surudu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ghb2qjs0f4g5khhn9ngpofl39c/xixebaduku.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/58765575901.pdfIn PDF document text
    • http://willbramephotography.com/12546581122.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8905e24e09fa46935ae82c0a26b0b4fa/30769989378.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/12789884687.pdfIn PDF document text
    • http://laduses.nl/image/file/kejobik.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/lamanigedijenupukofowexin.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/gedivesez.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/26882132268.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b4e55ef---94252976432.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/30936654262.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/40cal6u8vek9859qjqbfvkffq5/pibetido.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/fibawimenimubit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=investment+portfolio+performance+report+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 10800 bytes
SHA-256: 6d53fee89e5920fb6b8909f0acf3f5441b1209ae27b285a577214cb93a3c16fd
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 16168 bytes
SHA-256: fd4c413c9b33f944f0e531c5271cc1914ea9e0c7a2f385c447670a4484ba2c5a
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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