Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c83fadf2407bf08…

MALICIOUS

PDF

110.7 KB Created: 2021-07-25 00:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a8ee90705ef5fd99454d41432995ef49 SHA-1: 6f9a7adcbd6be69fb4e73d91fd971b51e9603bd0 SHA-256: 0c83fadf2407bf086669e78cc3b3a98b03e1223a9f81a17b9c64328bba30019f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites utilizing form plugins for file uploads, suggesting a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2fdecbd47585015225f546ac1c0d2805/motonifalosulowebuvemana.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2471db1abb---74699160730.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/2q0cc8hbhi5gbcn8pulvfud600/nobowufarum.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722d5234e88---voxigudujidu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fb8301f2074dcc03131b321da12a9223/melowapigowagitaxema.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/jologafuvanumuxikafi.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/e790cc476b3715c3cdbecca96b4637ce/88810283891.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaeaab1465---30023078302.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/93887233742.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e4e27dbfe52e4287c34c21e7e3356b3c/67346742067.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zabobinatezed.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zarijedadud.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/16229272174.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c672122c1417aa499cc9666fc5131399/90479196898.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/bupuzugexikanidosetij.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070301091073499.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/94291132672.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dea5bfe20---gorozuridupiwegipi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e4037d61---62780806451.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879fe259d6---rezipe.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/66886819061.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lerogolov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=modal+verbs+of+deduction+and+speculation+exercises+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018ce4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18CE4 19148 bytes
SHA-256: 1ad85bc7f7128cb6de2675d12499ab1ec71da7e7356079773bc91d0e4fe0f662
font_00_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 11016 bytes
SHA-256: 39c7fc412ebb7b8ae9e20c0e969da89d67890428b233f0c818ac1530fbb7acae
font_01_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 23564 bytes
SHA-256: aa5e1be7d565a29628d0bd55876739dc471bbfefa2ecb944f63ec292ea737850
font_02_sfnt_off000174d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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