Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cb86298b1d05f2…

MALICIOUS

PDF

79.1 KB Created: 2021-08-20 03:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a3d4d260e74978cb0040c2c46e6da6d SHA-1: 8938990a63085aecae1c0cbddfa982d909c02d62 SHA-256: c7cb86298b1d05f28dafcb031f1f41dc30399fec982b24b063e68cc26967d329
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://ikoi-es.club/yamituki-n/uploads/files/nutujutevibodu.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73721b8a98---74830795587.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c7d6c77e506bcb4f1152185e74d9152b/24063561256.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/5356023074.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/aaa90de54438b60373d62fdb278c6e60/wimutikov.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/pozavozonorivusaj.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076693a4db2c---xadoxawiduralotozevasob.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///wofefazedit.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/17594078972.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/futomunanazivugufekin.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc89351c4---fubagexojixiwo.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/96617624392.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46925595963.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c161679aa20---2813070923.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/54864704549.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/60922877793.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/sivamexisatetewuwapagok.pdfIn PDF document text
    • http://go-forum.cn/upload/files/86397187722.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c7582f361ba39a9ea2fe5e4f3636cba/15697560327.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4r94nn50r5qie78kerluoepoq/22494615277.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/51842804440.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47b9d2f44a---14942115327.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/lalasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=driver+nvidia+geforce+gt+220+windows+7PDF 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_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 16676 bytes
SHA-256: 8701d3f6a97a9e6ffbd912c7b18f591a942279ad0882899d81da6840611aecd7
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 11052 bytes
SHA-256: 989c9462c67c8090b319cf34ce0c302d2cdc474c656c8f55560743df2dc667be
font_02_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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