Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fcd6c535c986e9…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 165e292191632d9f3ef7efc34e0ed184 SHA-1: 27bd658639c40cd4861199e55699b1c23054b600 SHA-256: 87fcd6c535c986e91734b6f4e0109ab2c418c977a11c3d138cbb40797fa8e8d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://allytemp.ru/uplcv?utm_term=tableau+reporting+pdf PDF link annotation
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/60c0379633bfe3bfd9302505eb9be74f/6968815746.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/62187598569.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/31262277846.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/28264568223.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/63665905579.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/91153331207.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3f0265f5---simarerekidevazulemirajaf.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/55303760782.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b628434998---xagitegabikasubofunev.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/69ae7fb45109485de99bfd366bc8e170/21273939237.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bvm8if2ishaemr1pvhun0imbd2/gixowazejejularusivisat.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/49990842308.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/11169633242.pdfIn PDF document text
    • http://roocenter.ru/upload/file/digokafunezob.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3196cc7f3---tumowumomufixamipuxomep.pdfIn PDF document text
    • http://midel.me/userfiles/file/kukurobebixazuru.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/amamogefozowonusu.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/50024036617.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/wudajufapazupefosasaxu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210627101335.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083504fb857e---retosuxum.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/c0lkvk12ucsktpps9042fiirtm/kovaliv.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_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 10708 bytes
SHA-256: 873302cac614acefb6f778515d8403d8fafa5f5c7ee270121ab2e84b7c504783
font_02_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 17184 bytes
SHA-256: 14f0e6805fb6647f94af05443fd31d9635beef4684eededd476f9f3cbcc69a17

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