Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e6166372ff43ed…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 02:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d126b2c86b57ef6387ba88b40ce8aea5 SHA-1: 45f694709b097c69c9fb16096afb28a85d9da250 SHA-256: c4e6166372ff43edba3b9b2a21c551f8a78d5d9d26f858db5404e2823cb064ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=thriller+books+pdf+free PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161129ce2e13bb---xanonujoxakixuxexugele.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/4231766009.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/94811506813.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8cb2b923d---kozasaboxa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a00ae8fbb5449c580c671e45c6d9583d/giloxipa.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/76981530188.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/545812bbd635029300afc00b48363a79/71927127869.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/be37b3be69d7262d010a7c45ed2762aa/vidovirovanimikow.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/lisoxodetovavo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/56958685263.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/bidugejowamedifaxewojev.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/65314297456.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/jasono.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/gesukurotoledikavux.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/vipusumazaximisiramab.pdfIn PDF document text
    • http://mobiliteit.nu/files/52764522998.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ebjpokl21nd2rh4ac7tii6l7l7/91006092702.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/amu1seejotd6nf3t56pjde1hl5/rugatesokidopegaruged.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160821a33c55d5---libusu.pdfIn PDF document text
    • http://lejonhund.com/upload/gajom.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/dunubisidi.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/61082765399.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/15732593396107c8b060a81.pdfIn PDF document text
    • 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_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10424 bytes
SHA-256: 6dc635f9861a22e68b70c277d103a5add207ca677e9d684c56df51a7a604c4e5
font_02_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 16628 bytes
SHA-256: bff5038258a332119da7283e057a79fd87c7a734f11012eae139ccae0e719f43

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