Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49fbb15b045fed4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 18:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bf2d7f4ed69950472fffece37d47024 SHA-1: 2e28c018737f25e2f991e98e1252a62e02b82169 SHA-256: c49fbb15b045fed49377026ea29a5817f940eaedb46502270f4d3038b83a5c88
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://hftyby.com/upload_fck/file/2021-9-7/20210907050923687153.pdf In PDF document text
    • http://versobrokers.eu/userfiles/files/46242688697.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210912111004.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/saguz.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51bc5405a425f68ed1997bd16882d379/robekiboravokikopip.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/82036636187.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/6761142711.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/47370823659.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1feaa125---kavolux.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/4524906131.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16792776485.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8d5dc8d69daa73690e9b89c2f66c0c02/romezaxinowomafeguvo.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/95472904590.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/71928216740.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lk5n15h15ld4cd28443b68i8of/terewipalunafekafuzaj.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/20651733438.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/93861808478.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/51946904790.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/56303670337.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/dagitonawazimumuvoxesot.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8a4dfce0---sujurugugefuf.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/jivuxekimut.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/98592804667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mcmurry+organic+chemistry+9th+solution+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_off0000bfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC0 17080 bytes
SHA-256: e30cfffea78383e60325e0aea800806dbcaa9521212a27e377a1942fe0564010
font_01_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 11444 bytes
SHA-256: 115c4463ec940823b0500a30ab0293bcb0b7056568f3c43fc4773208001378bc
font_02_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1