Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1d9c45d6d0201c…

MALICIOUS

PDF

113.8 KB Created: 2021-08-20 19:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2d7f808972420834bb7e86ea0115f92 SHA-1: 1a56d22a73c2b2691ef38e96f3569fd682b138dc SHA-256: fd1d9c45d6d0201c56a45d36ebf06aabcd6e4b46656d105846774461009eb541
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many distinct hosts and URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0866ce4302---vaxixarugadelutexutod.pdf In PDF document text
    • http://extracam.es/app/webroot/arxius/file/pexudax.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070235ce21b8---xoxox.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oqsq2r26oai2ikdjvj28hkstnn/73907241930.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/458b9a2799bd59bdd1dd0d6e530a07a0/9137346849.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9811d9f20---43188058704.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/18818638535.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zenasodewodenamadeli.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1dda6a82---rebinosumamavuwe.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zosubijoxugobudej.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/59464514672.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/81307478132.pdfIn PDF document text
    • http://portableandcool.com/files/files/famobobolidopege.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/japegasunezotapejibetuzis.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/podefikolezukoz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608366b774935---2591261650.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92a435851---fupozakujenilavonogepebet.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7cae4894---nibanovowugituv.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999011be11c---levagimofunomuxidozat.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/dovidezavigi.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/powinofivozolurutawizora.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/16325671806.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/87909157603.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c72cce048---kikawepudovijek.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/55933863192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cen-tech+battery+charger+60431+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_off0001539d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539D 18656 bytes
SHA-256: 04d046b9d7e2ee441a5c2e8218ffbca807e8f75a1c2fdd93e80f5f43a3edcde3
font_01_sfnt_off000184cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE6 11308 bytes
SHA-256: 6e7c5840811d61923c402930f2ea20819f5abf7026591d1e8b373f86202f8834

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