Malicious PDF — malware analysis report

Static analysis result for SHA-256 4737b11a56480618…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 12:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 498b8fc312fb15446d6fcb7772a28749 SHA-1: 4ba0f3cd4a5bc00e0b86bf28f48c353c89021c5e SHA-256: 4737b11a5648061836da526a678c79d35c00def291204a9ce0320ecd8b9fb79c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for distributing malicious documents or redirecting users to phishing sites. The presence of multiple unknown URLs suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cde1265df4---22643775768.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/nekawutujifevo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120207115601---34645791406.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/sopegazor.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zamisegerovanavuvive.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7c34f5b8647a0ea7a024a8f41cf34eab/melutuzu.pdfIn PDF document text
    • https://cuichi177.com/uploads//files/202108030500416677.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/53627282806.pdfIn PDF document text
    • https://isosklo.cz./uploads/simadisuzasevuroralonelu.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/gikodotativit.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ad3db637---46882684634.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • https://kawanmto.info/contents/files/15143695646.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f17b28ce53c01a5d56bc906680bb6f44/53888167423.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/50275308789.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/pasaduxoje.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0e29161df8603fc1a1ae5d1f114088f9/55512237389.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/78180380954.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/mixab.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/bososixobe.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/12222053518.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082e872ad6ce---39046425853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=amelie+nothomb+fear+and+trembling+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10900 bytes
SHA-256: c9629419b7bd22156d6426968f776a24886f32f23877f83a85dbbbb6e1085f62
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 20328 bytes
SHA-256: d7d37ab96e9d37deb21b32c6b131cbf7304aaed0bcc5ddc30aa88beaa22a6616

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