Malicious PDF — malware analysis report

Static analysis result for SHA-256 703c9222ba872c70…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 01:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 744ac64ac383a58a8c5d4432d7bf95ca SHA-1: c4551df78864cb3b1f015faaab42392a7046f5ca SHA-256: 703c9222ba872c70f45b9c888420eddb328e0e43fb8209dfc2e5bd558b1179d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS upload storage. This suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://webmenuplus.com/images/file/30045896667.pdf In PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/04/jibedonisokinawosirumot.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c567f6de---tiromaboveperokiwikawemom.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ovsdl088sjej63q1hocagsmj91/51519766547.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/1737955071.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/58dfc04da17e03a90ac17bc941650fff/10376410059.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608770a3785ef---96082314801.pdfIn PDF document text
    • http://screen.by/images/file/tigivakuxanas.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec1783490---bezamexarisolero.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wezemepokesopojoliwer.pdfIn PDF document text
    • http://llux.vn/uploads/files/bifubulima.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/kufozamumonin.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/54577370811.pdfIn PDF document text
    • http://bjjiffy.com/upload/15909894026.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c926ffc074c---kixojonigusorikenigobadaw.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/ralawipojowobigumigawi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e21d5821647---12453372686.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sojelirewosa.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/belivabefijetozuged.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/uhmmtuoodrthnv8s5e05v572k4/dozanawuvedi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/28917645573.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/iqfefl4psa0it602lecj3d99s6/25937493934.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5b0d08ca---4686482840.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/sasonelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=online+converter+free+jpg+to+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_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 17108 bytes
SHA-256: 95269f84c89d3b899aa477b79eb53d92085db7ab95de54e18eaa7a26189f566c
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10684 bytes
SHA-256: 42acbe97351187d8a7d4796b7b04ea967afca90e15b68722086e82fa18d2f6e0
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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