Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8291b5f71de5a9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 22:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 011e531497cb4a6d6bd1619bd33a11ab SHA-1: 7ebcd0caa0442b7750cd9d6a9b0ed94b972fa0fa SHA-256: 9e8291b5f71de5a990bbf0d6939c50086097e9c6ec2d085755bbb34133c8c826
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on potentially compromised or disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7b276b55ae717bd9037b320037331a93/kunetigigatazu.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/19321648426.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///44890343068.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tovasaworuku.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/vovifalufomunideko.pdfIn PDF document text
    • http://standdominica.org/files/files/gofedokizewigipomawera.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/demalolek.pdfIn PDF document text
    • http://sgpeo.pl/users/file/jejugebemo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tuzobamupumoxasobivi.pdfIn PDF document text
    • https://12tiga.com/contents//files/34095353443.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f547875783---35022131813.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/sixupefiwebalopexowana.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/5229703006.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/fanopuliro.pdfIn PDF document text
    • http://chayka-svg.ru/files/63680310847.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/euiv827h7ov7ni46ulq2idh1s1/totoni.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86685906734.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/nojutibelu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zaleno.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/60759621393.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/rejotixesem.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/69532448121.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c6cc62fcffa5ff063c7f83edd9cb4d0f/zuxovaxewajonogus.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/sigeropafimojabur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=font+finder+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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 10092 bytes
SHA-256: 2cbc0e6379c5bdeb2f11a88662ad59555551f8f9dcb9e1082bb55b069ca82b34
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 17384 bytes
SHA-256: 8f9c5f2f9bb7e740bf8ce5b983792e78b7867b9a3f6e1a2f5fbc3fbe43e77342

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