Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be0fa4211330cf…

MALICIOUS

PDF

91.7 KB Created: 2021-08-09 08:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4036b88cb4460c51f99c70abca71988c SHA-1: 38e8bff32ee08018dca728bc7e71c5f56d2be841 SHA-256: f8be0fa4211330cfd8ddabcdb020946a75442058c30ef99f1fcde8606ef4451d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, a common technique for hosting malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a method to bypass gateway security. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+show+hidden+apps+in+honor+9+lite PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842afa826b---79643197044.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ihaufc2ji3qq7hhhsuejnhcso7/vuxupefefitu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7277b3f33120ee88510a5ede7d91986a/rufozexidipojokikobivuju.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/59557973406.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/nufoworupilopegebunepud.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/51747095494.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/23418921577.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7b2dvd4e911cpd2kv5p43r5pk3/57364813022.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65c4900d7---71102076992.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/99080379491.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/bumefuf.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4207b6455---1513581766.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hf5had8cu7rv1b58fa0dd84sc8/ximuboxifan.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/sebarirojiworo.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/finuwodewixebiwetojiw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63c37ba3b---7081357927.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a47bfe87e2---buviwinonomasurerexirume.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/98216031485.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160772a3822827---58210601563.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/puzapuzojejutaporedosa.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/girusifesezasiv.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/72356336127.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_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 17336 bytes
SHA-256: 389b4bfd51d39bb8b5ad39f9e12e320c7bbf26a4172008a5858489c4a56b1bbe
font_01_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14756 10732 bytes
SHA-256: fcdad8b1d8a69717e32adcaa322ca47f4d31aa873f18a9f2141ea6c03d1b22bf

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