Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d5c75f198b4456…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 12:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 389a79a8e841fc682e29dda920fa31f6 SHA-1: 1d0b4e3907df49d0872df5c34016a145bc156218 SHA-256: e5d5c75f198b4456c10fd4d63ba124ad3690c9c28d8cd033ea65d3c6d6d3e2d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://diphong.com/uploads/68998910311.pdf In PDF document text
    • http://khachsansapa.vn/webroot/img/files/xugakiweberulemo.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/85743749854.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///ximorabajovupemazoze.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/19060327584.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/xebejopaz.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/zakanot.pdfIn PDF document text
    • http://vinmexindia.com/uploads/88849197143.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/sapuvatigazijejesidaleri.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491f3e2001---96108068418.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3593beaafaaccfe03130932b8239e992/bemerubigilizoxeboxuji.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd10bd881e---wabopowofuk.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/59728664368.pdfIn PDF document text
    • https://mahae.hu/files/files/53485770716.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zetidiwabibabodo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ct868ak1f0v7e7kvqh01g4t7jb/bijulolavukikese.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160901ff5907ff---88044899640.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/4959003268.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/webibalozuvu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/83183053587.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xibigodik.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/gebodavemebuvanerebavipu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c403d4d34---xajajijutujewixemenamak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=whiteface+mountain+activitiesPDF 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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 18128 bytes
SHA-256: 420db31c0a505dd3db919dd299c22d9adffa8b252af8065699496349004fd5bd
font_01_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 10616 bytes
SHA-256: d4301e6310b60a702d537f937cef3c1a8e70296fff341543bbc92b632d7f2908
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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