Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc703e7a84a1b5ee…

MALICIOUS

PDF

102.4 KB Created: 2021-07-09 17:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 924414779ad57466ddbabfb7883200ad SHA-1: b7481bf04aa6297c7afbbae0ccab32f5e80b39cd SHA-256: bc703e7a84a1b5eedc56dbec3b16a3e6d9aa721fba847fd8a1dd4be75864cb2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs and link farms points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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 http://airelimpio.mx/img/editor/file/95971317752.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d25821c97a2---62755036244.pdfIn PDF document text
    • http://sns.hu/_user/file/78989321741.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abe87e583aa---73514460129.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/28644416388.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/rijuwivegosilarebi.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/78756793292.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/23193809082.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/meet00t80ec7h4bnugthp7dj3s/lobexuxodobevofi.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rugawoxiwaxazisow.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vodusetanoliwutusopamux.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6cd1c9c9---67575833123.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf010a6a3c6---85976142313.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d26d077363ed7ab970c3fd788849ff09/3854859358.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3s7957jk595hv7ceqq6fuop16c/sititovurezelad.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/521300c48d4c86e1dd7cd1897877d182/12830358176.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/25607751203.pdfIn PDF document text
    • https://activepymes.com/pub/file/24772843407.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qtsgvplt8c7qa9hgsi91nhvlf5/65537427255.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf50e78a6---93318841154.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73ef323ea---kadejurupekufiwilodawaw.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewobesizexelebozefomubex.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/95909889210.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vopipesifowuluwulu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/7308793788.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/feridalufuma.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fb6f6077a6da2aa16fda0d60adb27641/69012592160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+vector+sum+of+two+forces+is+perpendicularPDF 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_off00012b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 17456 bytes
SHA-256: 2b2f2c6761d0ff16ab36442add27a6508feb3c0c4f1eb3d53a94f69b9f380fda
font_01_sfnt_off000159d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D6 11100 bytes
SHA-256: fd95508a43fac250f10f024938dd2d4c916b967604f0dd56afb2a9267819fb7c
font_02_sfnt_off000173a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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