Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef8805fcbe8e28c…

MALICIOUS

PDF

105.8 KB Created: 2021-09-05 03:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 651be7b98d6a9dfa336ee71a6396d9ec SHA-1: e20d853c76149d62cff9a81fd925af66dca83276 SHA-256: aef8805fcbe8e28caa14a32a2ff0070be92b8c1177c18e5c469cd4c7f3847d93
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://crewmak.ru/uplcv?utm_term=number+theory+%28dover+books+on+mathematics%29+pdf PDF link annotation
    • http://sakaryakasaplarodasi.org/userfiles/file/fuzanesakejivujazifekew.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/vuzepenunabimumir.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/miwegiwubafirosamapan.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/74995592169.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5d83993fd---tasukejanoxabepenifazi.pdfIn PDF document text
    • http://toonesk.com/upload/lexolovot.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0eea6s6bi2oles4b7c4i8mopgh/kubidakizewofitililuv.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/kosalo.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/varuxorijojinejafov.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8t29vrplpug1k8upl13juver8/xufududakopu.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6l79f4611aaiqedneudv4bcri2/togopasemipe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85122921125.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tv256mic5geqjsme5hp2sk32h5/17517269682.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vikopijewa.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/mafawitegajabetenajirodoj.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pn6ci5ce0o55tid73lqdjvhm2n/96737045623.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db562d504---zidusaxogabo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/35397991976.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/kaninoxeko.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611957d2269f5---3818925596.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_off0001304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 20728 bytes
SHA-256: 8970e879d4f3860886d9d950a4aa5b61368cbd160b89e269e2e46a4855ac141d
font_01_sfnt_off000165ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EF 11484 bytes
SHA-256: 5365dd770071765fb678327ebdc66e50b4408b7a534637b704f4497f4d6af79f
font_02_sfnt_off000180e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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