Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1711b13c0bf0a7…

MALICIOUS

PDF

81.4 KB Created: 2021-08-17 21:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92efd89367199389b44bb920f9a9ae1b SHA-1: b3cdb7c818d767a4b841aa4814a6be5378704f39 SHA-256: 2f1711b13c0bf0a7031ad17126fd69f743dd83cfbe02e1c2ce6941b5e8239b8d
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 flagged as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=douglas+county+school+district+nevada+schedule PDF link annotation
    • https://anaksemut.com/contents//files/76906431675.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/33922820942.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/49433223158.pdfIn PDF document text
    • https://hse.tw/upload/file/57884800595.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/scqca75hcatjgatjr2mt3th5a6/44805481662.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/325394b2fdc053d4c8a41e92f7d4c40d/rinefageruxixarafuxapa.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/getiw.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/rimegarobafiwuzen.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/negitutepovaw.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kibasenavuk.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dojonegamefegepoxir.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf64ed8dc---rulibuvijomuxa.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/girevo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a2f0318f6---82928009295.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3069c599206932690d8398412c4fc82d/8313826401.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d96293b75---werosinimatap.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/75430951647.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/depesalesawabuguv.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fbc54b40b---miguvilekakotax.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/jumefo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/560f7a1f099044d89bca603491f8be12/22895719013.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/77035668411.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 16840 bytes
SHA-256: 0b79ce97b8b91fcc40d730ff796578f7f8fd7bacf13d12cda6035883ac1e8778
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10928 bytes
SHA-256: 07f4916d7e686c5b694aede220e0503da80a58458714304403b280dd1c868f10

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