Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9873fac5104153…

MALICIOUS

PDF

91.9 KB Created: 2021-08-17 20:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d64d8e814248a8dfcdfe1e0f1f2a84bd SHA-1: c627200d8d4db9179790380a47dec30ec1b1732e SHA-256: 8c9873fac51041536b65a9680d638462ea6ccb5691bcc3bf0b4bbf098c8cad0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/a3jr5sm1n24117hn1dhmn9o0jg/4725612825.pdf In PDF document text
    • http://nceed.kr/pds/userfiles/files/65790401578.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3b9f5687c6cf475fdcbb589e8750f71a/wesidofasezekurazubibanik.pdfIn PDF document text
    • http://camonetinternational.com/files/file/wetonutatotifamonazev.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/leliloxulazezaxevadezeti.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rff1uhuf1m30fpsak7f8o7rhs7/53144900559.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/dozinu.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/boxifexajafokofazejose.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5a8e2ca4---vazetebunanapunurakaw.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b014abdd316f88701b311faed4bffd9/xapamijuvajosoponogezuku.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/suboxutunolepajuwe.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/27347676830.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610557e82ea66---65049009481.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/37723977837.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096961ed201f---nugufikenagofupaku.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/sidamorozulixubed.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/68416316988.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/46494715375.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/vosutisowise.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/16639839161.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/wokosumonix.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/abae8e948af4c27ddcc149692667503c/12226369070.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cedd95cbb---nawazojuwedewigo.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/roritiwubop.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/46819247155.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c29f3a01a---xinedet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=job+application+form+format+in+marathiPDF 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_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 19732 bytes
SHA-256: 455952474f2052389e9c38523e0a35f344d6efcb7875a789f6492fd2ce36e22c
font_01_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 10576 bytes
SHA-256: 04d188df7f448343eaa56e7d136352dbff761eea2fe5dda0337fda7558cb959f
font_02_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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