Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d667b5379d8b451…

MALICIOUS

PDF

95.0 KB Created: 2021-09-08 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b18c8c26cca94786fd66d1f7e6b0384 SHA-1: 718e2e453ba190885d4c1c6238b181c03aa0b2e6 SHA-256: 7d667b5379d8b4517d84e0d316a0f54771a217635ca5ebe5e2ade9b031efc773
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://varida-tech.com/ckfinder/userfiles/files/42966530912.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vmicg2js1mft5reank0ca21uct/daboleduperedemedug.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/90802538730.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/75989196067.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/zavekuwiguniwofixixusugig.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/rinaxudimuroj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3689d5094---53329858506.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/99367056429.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/tisotufukusoxab.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/tufawudufidisepupu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/33501951821.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/81212707596.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d52cb05edc09e68161e958f4cf797375/toxopawafikit.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/75464603279.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b472d5be3c9---76884604789.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/81918420326.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/75891473130.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/46552521211.pdfIn PDF document text
    • http://kustari.net/userfiles/file/68631469938.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/96803136089.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/zekoxebogujebosasadudu.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/zijusenal.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6a1dac954f7fcc032a66406a565b0de3/67978469329.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/59118815077.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3001fa68a33525d838cb25aa288d1429/zuzolugonoxegasuvibotip.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/86795762686.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6227739408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=questions+on+elasticity+of+demand+and+supply+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_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10956 bytes
SHA-256: 4a7300ec43d690b37f8004e7aa1ec5ad5d6297d677ec40923ee8d1122a93ccad
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 18676 bytes
SHA-256: a135d11edb7250eba6547e99d704aa39009933b3b28ba1494b92d851fdf27059

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