Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e85a3250f0b8148…

MALICIOUS

PDF

98.2 KB Created: 2021-07-07 06:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7c54a88475d03a1704bc221eef33f371 SHA-1: 9bc4d71912af833a502a843d787424c5f72ceb6b SHA-256: 1e85a3250f0b814888cdc467fd27aef947fd6d76aa0b3fe6e0b3316e275f7e56
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://rolmech-strzelno.pl/Upload/file/40629586937.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160adb71f11c12---56204276650.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/92927f1fad38710e3e7ba5e5560848e1/52548522864.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a915977145---25869090707.pdfIn PDF document text
    • https://marigabung.com/contents//files/7913963949.pdfIn PDF document text
    • http://epmachine.ru/d/files/tufakisabeno.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82d894eaf---49987142405.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/79846888729.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/57737599222.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160747de0a7125---lezonebugibux.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/periraxosavidej.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/motufufogi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504b420bd4---23122093820.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6albas5f88jhvg786m4k4cien2/detuduradojafarasor.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/36866751138.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/30965730436.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b74434829---44539241360.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce2912788---taxujefusavoz.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ag90np7nhn0ce8s2heor99m113/52339122657.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/torogarowamiwazuv.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96b4c4b66e---tuzupigo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceea527e582---roterakawud.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e67dcf8bb9051c34872a74d8ec8abe31/budigexagonititu.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/57272334223.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4118292a22---94140470167.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/26d7844f57ad2fec3b49e8dc84bcc17b/minagabaxukugedirajo.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/junivupenapopizapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wow+specs+recommendedPDF 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_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10356 bytes
SHA-256: 5a0b30bf218b2ec78af0887a84a9d2caa55e1836613787571111ff6350934b09
font_01_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 17912 bytes
SHA-256: 958a3af28048b8f3d356eee97635fb06e8f3005d7a00ac0f7d07b708f88d1657
font_02_sfnt_off00016337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1