Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a78259fd0010fe…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 11:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d9bfbccd9c270593e15d3f8c0e593ae SHA-1: 7d9864aa217a33cd1686281989c84ee0df01c5e2 SHA-256: 45a78259fd0010fe36ec8f1d47045d063f2e1146663be2142b3351fa14c4d3c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/prplp4m6b24v9masuqhqhg8ce3/kowatujexoga.pdf In PDF document text
    • https://mallncart.com/userfiles/files/fibepoluxuwakevutizij.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/72093673398.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/6fbd4d7cae97f13baa8afe0d63f30ffb/45129597756.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/kifurovo.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c22e8c4102ac0c1aee300e3ec72facc6/98568923539.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe72885c98---54231393848.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/pamajopimofekedufovoka.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f19700d8d---pumapuxa.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2a9836e31d2a74bb211f97f68b6baf80/dixogezafelesinupin.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/semepusoviverofu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/fepedujitixakifiwarerokib.pdfIn PDF document text
    • http://euro-ex.com/zanozimijaxefam.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161041bbcf37d2---kawolozavotivodotoj.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae383091d8e---pesuv.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4da7d72486fa7a7fb6b1c9df7e9d743/polijanililigufibaxap.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba36090ce---kalulivuvasetefo.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/99830738615.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/rujepigejamifipolejibaj.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6b273b7408d1e7999a388efe1a7a2d1f/nilikilamasu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3d1823d5ca6da2bd9ffb3787f08eb5b6/71265127989.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c924138b---73589998187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rosemount+3100+ultrasonic+level+transmitter+manualPDF 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_off0000c119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 17892 bytes
SHA-256: b161c6760fc5a976f67b336d5785aa2e76e8cb5e4c4fa26bd50ffa4b1c7c287e
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10948 bytes
SHA-256: f4376d05ae081b3461e3727ab420834aefef54a91c43f9707f3af1780af8ad72

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