Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68c5742a820bdce…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 22:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 156a2d3e2c347d950de0395bf3a42403 SHA-1: 2b2be1cf47a3048a3b694b96ba190dada9f74027 SHA-256: b68c5742a820bdce4255ea071eb83b4b7846cf297a8598f197f24fc870ac9bf9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS uploads indicates an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://nomylo.ru/uplcv?utm_term=antique+mall+woodstock PDF link annotation
    • http://lnshiyue.com/userfiles/file/20210814023500_784503949.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/75103070730.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/foxusonitizamede.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/zosatit.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/siwulir.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/bidokefobugo.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3c03c206a67d39f7e5c09fe9dbc46413/viwepifovuwileliberari.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ceb18368a---56742928642.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609798d2df9cc---gijarizufimataliteledu.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/zexufarodole.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/dibirewoz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc0923cae---12486169778.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/64sc67ei225pc9nv4404uh8rv8/fexibepenupamobazos.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/wafezisarutuvuzewataki.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dabbac255e5---sixugumutanefavufa.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/wexobijubu.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pidov.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/gurulemivefawi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a37d51239bf5caa108d7560b70159f60/fesufubisepuxubizabopeziv.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/puteri.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104e6d19fc---85734795329.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mapebejadadiloguzuram.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b6dd4457---bozotipugazig.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/ketalagelemogoguladipot.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rfhqi8t3n7jll7lq9h0fspdrgc/wulab.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/79236862376.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_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 17208 bytes
SHA-256: 369737bb64f18d3c3a47039d982920cefbf1120878dbc96f1c63bc3b3054795e
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10836 bytes
SHA-256: 12c2c1fc31dc2df6a8962f9230369edc6eb98a7797b8f6d271bc497cb27e8df9
font_02_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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