Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4f74efa310f04c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 02:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37e9e4d4dd676369c49d0de92c0bc585 SHA-1: 0b8c81bf9b44cc64b939831b24c825c99c840fbe SHA-256: eb4f74efa310f04ccee231feee5dd13a4b35a97368c86f1ea64cdcab82de870c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The presence of urgency lures suggests an attempt to deceive the user into clicking these links. No scripts were extracted, but the overall structure and URL findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=can+i+get+free+gems+in+coc PDF link annotation
    • https://abisspaandboutique.com/nbloom/fckuploads/file/nasesupuzivezerit.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/45952609806.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437027afad6---nileximagegupixepebeteves.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/951811871.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zukiwubevagexezagadofame.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/16816599105.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/84463853829.pdfIn PDF document text
    • http://mamam.by/upload/File/file/kedotefor.pdfIn PDF document text
    • https://intersat.lv/files/file/melesemobuvinulujukirixig.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/23350828332.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/16493455809.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/53792011457.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23318977344.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/8062024304.pdfIn PDF document text
    • http://builderall.info/userfiles/file/85139173597.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16146ab9452261---58083658451.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210906_024946.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pibagup.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/simogak.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/zetod.pdfIn PDF document text
    • https://webaprint.be/img/file/gubilavoranepel.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2630a1451---63410729846.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613825ff78f07---37109491974.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/19080440343.pdfIn PDF document text
    • https://ocw.tw/uploads/files/35774614418.pdfIn PDF document text
    • 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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10664 bytes
SHA-256: eb64ac0f8b42b0694643528953e09f23b9f0a38f940750b4ad93eae52cabfd09
font_01_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 17292 bytes
SHA-256: 996b25a599d2d16220e9f6f9b65ae15f9cbae64a2bdfebc4225b90adbbbec0d8

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