Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8802b1a5ee9e6f0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 14:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d7f07cc0bea5ce45034ad8cbb1bd12a SHA-1: 3188b68c995e51d7cb9a2d9ad3f8a749b2db2623 SHA-256: b8802b1a5ee9e6f012a4a1b1c217d96e3ec3a909e7262285ae04933ff7342a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or engage in SEO spam, rather than delivering a direct payload from this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a11ccdc8e---lujebomitas.pdf In PDF document text
    • http://moestuinwebshop.nl/userfiles/file/68563996268.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9db3ee64de64d196265da31a6fe0757f/gugononaxored.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/02723b7692d0265860b0c74a6fa064f8/95899389983.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/47954974934.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/68226010002.pdfIn PDF document text
    • http://rayer.cn/d/files/tezosawibafewixemu.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/65912677984.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a45b63c42---61209652726.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/5317146470.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/23435680966.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d05264fa---davozegeridobuvinusim.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/79290fed53630e85958beaf1b1bcc133/vikix.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/vejawelewere.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/95670253843.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/68695094425.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd16e9d679---83849540140.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/nanipu.pdfIn PDF document text
    • http://serting.eu/userfiles/files/82964842007.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3375937ff2---28223375877.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/88382931116.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kopupudetofidebobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=renewable+energy+2019+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 11040 bytes
SHA-256: b6c22fe4aad2b03e0e594dd76c01e515fdba5ee0eb4cbad32183da9970a292d1
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 17480 bytes
SHA-256: 8f32414ebc9f9174b561dc0e866547099cd9d2f55afb39a435a27f72ff3031dd

Open this report in the interactive analyzer, or submit your own file for analysis.