Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0d858533c0a94f…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 07:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95b63ae8b370d817bea274e4a098bf39 SHA-1: 75fe13c9a5e5effe198961fee1101d1f7812e01b SHA-256: 7c0d858533c0a94f7b477212615e94c35d6eaeec6660cca9d283ad3e5c251671
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a variety of domains for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bya-ingenieria.com/ckfinder/userfiles/files/59877555161.pdf In PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/12110616612.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/zikesosudufujolawefilo.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/durukekadakulo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/58273064672.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/kogiju.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1499253a---80362479598.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094312b759c6---todebuzetadijasut.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/kogofimatosigodibav.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/japomazuvevekasiv.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6ca45368f6ad88653571fff0b6ee1730/nurotopoxuvupinasi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1248755e68af033b83dd4ebf95990db9/70798141844.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/871619bf0a0dc6829875fb618951da57/12005327553.pdfIn PDF document text
    • http://clarasonic.com/upload/file/nivuve.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sotagomujupofededupi.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/piwofenuvigofapobonemido.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/18489377339.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e52fb2658---81815531163.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/wezigakifubalerelunu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2a5b2ffc---josexerarajo.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715b339ca6e---48574238853.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b822d686f9---96677221541.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b7d81ddd---kekarowokix.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/ketesebufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=permutations+vs+combinations+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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 17708 bytes
SHA-256: 3cbafc57ceeb2bd3de59facc815e19ec3f79aca1f303376d2189ace7a0dec97f
font_01_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 11040 bytes
SHA-256: 24162b02d7a0a6dac92bf077cd951989d6e8788dc7858d4b736d461f4a96c30f