Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d9e55e6fc6af49…

MALICIOUS

PDF

86.7 KB Created: 2021-07-20 12:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4589c33e673add179063e683ee95cf6b SHA-1: d4662283e53978039e2b612f6a012bed05c6c6d5 SHA-256: b8d9e55e6fc6af492cf3c4b9bb075fe4ab184887eb2f204061381145c4c0e2ff
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload URLs, many of which host PDF files. This pattern suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36ef65909---29698548949.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3bf8842e38c2a9aeab99f53378a4848d/nijutanesabibaxe.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cd183a0b8---76663865997.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074b387b930a---69135420462.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4b4bc441---45601772723.pdf
    • http://cnex.cc/images/blog//file/5309633452.pdf
    • http://aklond.com/UploadFilesfile///2021043015000749.pdf
    • https://zlatartopalovic.rs//files/71875675140.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0ce7fffe8e763e372a580f9a27994835/67076303155.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d503a450---nimukineze.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1e9b4cc2a225cb8dbded891e7009dfa2/36966755231.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/sm6q8ou9k3nccar2gia9t694ou/lezijalam.pdf
    • http://koreanhotpot.com/uploads/files/34703299135.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5fa017d01---49654037390.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160789c33f1306---51678427228.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a480f371680---70628957678.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e9e486c1c0d67eb0b0f965804ee029c/bojor.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96a8608ef---ridatupogu.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8261e65663415f03e0ceef23a7fed269/4078521388.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4d184e80---mijonelimu.pdf
    • https://luyenthitoeic.info/userfiles/file/vulorol.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d65efc8cd32bbd15b0ac99cde6dfe1bd/likibowuxukapegabufunon.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/g5h8dqh86f5uicgi6gs7tipbdu/94799326149.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/81798173658.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=avriel+and+the+sequoias+band+members
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf0.bin
fa73d852f3fa508be21583b84a78abe92f90905961a1aa747e485c1420e24257
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10944 bytes
font_01_sfnt_off000106e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
font_02_sfnt_off00011ef2.bin
0280472eb226cffc40fd0b210d9a880ced05860253369813236254d3374524d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 17896 bytes