Malicious PDF — malware analysis report

Static analysis result for SHA-256 876ca0c2341565c0…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 14:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4c449e3778f3de6d8a9eda33a7dcad8b SHA-1: 467ddd32c409d9847e664c89cc93278212209feb SHA-256: 876ca0c2341565c06627a6d20ed1b4ba5fac129b0a87c3af18575f75706caec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and compromised CMS uploads strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=hypersensitivity+adhd+adults PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c68764a8521---wegobesasemed.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/62553134809.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5f1f29ba---disaxuniwulotoxa.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8165cf4522e987a89140d92c82fc0a6b/51200176869.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rbsmchmtutslktauosq5jj6mha/31294372180.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/82458680834.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a16a5359f---kapitenewajav.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/sefuxebumulen.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/93799378786.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608629c42b0a2---xumazalepufujatovin.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e2beb8487---76679895890.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/mifus.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wezizabesejunepawuvebiri.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e55fad75d8a71b6514f0afd8cd8d2e2b/38527091911.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/guler.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/42668059963.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c085139f---98278050371.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/f5ikvsr3n5v70g3ahfb9jcqb0q/zovibelesifojalobafovafo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502181558_1787223155.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/lidupipakipilukoremuxib.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4947f1f3---wiridixurawijikebosegoj.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/duzilejolodel.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/diwadepitopapebod.pdfIn PDF document text
    • https://sanidom.pl/img/file/xusimebofidegidaxuwigarem.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/28244901252.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_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 10640 bytes
SHA-256: 6fa71bb7301c7cc1f86f3d22b949039dae465e667d221ff288aecf85455d5e0f
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 17544 bytes
SHA-256: b831680fe0963bcea8bebc3b66f6841e76c5009f8fd33f3b3a3a6ed5c4e592e4