Malicious PDF — malware analysis report

Static analysis result for SHA-256 663b42f82318669a…

MALICIOUS

PDF

84.4 KB Created: 2021-08-02 11:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e835ce7cf0adde4b25a3bd88fcf6699 SHA-1: d828021deba0019225ce52c3612ce17ab57b3260 SHA-256: 663b42f82318669a29beee498790724b446e1303598cf8fc3090f23118e33062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/204ca786bd7d5e5d1f2eee04b0e77457/gosusaxavaworopiv.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9190cb74a1020b002574dbbd1cdb7bb6/kuremuwugula.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ea3bc3adb9b19b490a8a7b888bcb812e/latodowunixowedolamitef.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/wuronesokatugori.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160789a07a6b52---95873416795.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16091d5a37bb29---xupezibesinagatovel.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/19137393004.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af63e72c55---98554664117.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fesudojizazujo.pdfIn PDF document text
    • https://jetaime-shop.com/files/89054867317.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/moruwinufewutitakesuz.pdfIn PDF document text
    • http://plncse.hu/php_data/file/wikefodujuwomalowukekisen.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/66080175457.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4edf1dab639b8c633d0696599ed45d2b/jajusezudugigigujavelalu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/0bdb1ae19982fcae2f85014f412900e3/72637934416.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/bagusibutomupi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tp5an79bik1rs9n14s0drg23mg/42272456459.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/devebumuruvisoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+reset+honeywell+thermostat+wifiPDF 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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 17292 bytes
SHA-256: 8601cf3542d8a7018f25d48d5120e987ed2ba821ab4f20c68b5c723767ceff1a
font_01_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 10668 bytes
SHA-256: 20e6e3540efeee03a7b7b2b0f946fa5d7b6afe9c547f3c223de5194b662962e6
font_02_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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