Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b577b541274069…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 11:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a62f12258ebb5b1b082ee139e9040971 SHA-1: a50f306294e3fd56a2a049d6fec1cbac86b12b28 SHA-256: d7b577b541274069f85c5840216b7467a164b73128818774027b40ad3d1340ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=physiology+sembulingam+pdf+free PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607007dc44a26---4641370263.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/54478884109.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/nuvopebaremegodeki.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/rulowevuwerawotopi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161025be031051---38978284556.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d84817d7---sogugukalakurizavemijile.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/zulokojevapijajudilemo.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/gosujavizomogukisatup.pdfIn PDF document text
    • http://fitviewer.biz/files/file/67903514812.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/i2tbm63pb3oubjam7pkd6jfsdl/siketa.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/19559381153.pdfIn PDF document text
    • http://sjanzee.nl/file/selelosubapuxamegawovon.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/23571688846.pdfIn PDF document text
    • http://dd-eng.com/files/files/nakofijalape.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608012cc742e7---13935466546.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075851c5165f---kemirekiturupakumozek.pdfIn PDF document text
    • https://onlinendttraining.com/files/sawofajoxefabuwufof.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210826_E2F3FAA0AA6A300B.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/14207531c8bb50398df37cb281d4211a/fusalurutukiwopag.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/5271923771.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sezazizarimosila.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609475884bda4---bidaj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee5550412---45335471860.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779ee99be0d---25729788765.pdfIn PDF document text
    • http://kmsenior.org/file/files/15400289184.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/bofinajibepizev.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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 11204 bytes
SHA-256: 8779f9d64f9dca36cc66c2fa8297b8fd745ef4b71e2675fd7317183aa3cbcef6
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 17260 bytes
SHA-256: 5eb81171c18468900850bb7477084f86da092b457837aad2074a256e8f6269df
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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