Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc52f3e28681d731…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37aecb58bb452e4175e0c96eccc501d8 SHA-1: 46090b1e1df8765effe9a551885e7c625fb4d079 SHA-256: bc52f3e28681d73157f078b90439ec6046c1d901b2bdc944749c6afa16350ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=topeak+baby+seat+manual PDF link annotation
    • http://sosnovgeo.ru/userfiles/file/92235256862.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/79969893820.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/90107374072.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c798ef46---lujevuj.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/48539702343.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jubakigonukewadobeliga.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e4b9bef9d---vawiraku.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/40418976558.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2ff48ffa---36932453582.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e5a672bbbe502eef03bf87565bb9fa82/bawonon.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16123480228b5e---63427171350.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/91672292413.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9mo667a3265laldn19l0nbahjc/49101948608.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38818f526---xubovezagemazajadusovi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3378978cd8---365868258.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/11964301780.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1a303cfe193140cd96258741a459f10e/tipuwupenivate.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062612031373499.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/dejosawamubupaz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a6bf0196baac2a9c44d369a3ec4b869d/6577752534.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/42372129373.pdfIn PDF document text
    • http://santehnika34.ru/images/file/87991420509.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160976a96b8367---55643002652.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/9pvaulbd0m2to970kfmrdl3bcm/kigixiloxawofaziponoko.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/97628040859.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_off0000bdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF0 10632 bytes
SHA-256: 6d9605925c657d9b545f5caabd05ff3fa72f5d2511d5cd0885550cf594a6faca
font_01_sfnt_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 16248 bytes
SHA-256: 9c22d001485e53b63c66311046d75f3921a6c952d96e1b440389797935dcc89f
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1