Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bccf87f6ed37c57…

MALICIOUS

PDF

81.4 KB Created: 2021-08-27 07:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 343dc6bffad358060703cad320984bed SHA-1: 31048e5ecbd29e9429f627751bb354a6dac6c482 SHA-256: 8bccf87f6ed37c57b3a150a930e018fb9725fddf73e8e12ee93581fd90462c36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URIs and link farms on disposable hosting indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tn347rthqcu8g79uh3jfos3lbb/kobapilof.pdf In PDF document text
    • https://bloomland.com/sites/bloomland.com/files/fobovilipogaw.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/wokivobun.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/zutatubirewew.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/mumimofaxikufagonumalumeg.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/rufifafewu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d3993c6c---48776474952.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d353f0b9bd---pafijatutogilexakekojas.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c4ff0e9b---zokixugaz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5779869a7---nabukejojorijid.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bfc9aba5---97292585277.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/nawesolimesurekagada.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/19213716313.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/64859023640.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/vuzev.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/26692915689.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f4c6fa12c9dd9a1c368b809dd5cc54e4/2673380600.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/mugubovopajadagedavazapo.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/kavisim.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39753047058.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/duzosufofozuwonepabiw.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/47231940945.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/mn1n7jjccdk7r3p1ktfg0cnd54/99874318467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=deal+or+no+deal+online+game+unblockedPDF 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 10780 bytes
SHA-256: e1e65a33a96e2e85b277e09fdcfcebd84bcdfdd4e068fb8fd6fdbc1b959fe258
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16876 bytes
SHA-256: fa69bc8eede467d3b8bc3fd59342c5944f077d813de299862c713ec03711144d

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