Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67fcfbf7b81b62d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 21:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97a74143b2967747f40b5160ce990302 SHA-1: 6cfaead888937325aa38ec9d191a5c17cd6c76b9 SHA-256: a67fcfbf7b81b62df2c1f077a78386b530e3f3710328f3cd41fbd74dc2f891c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://leavereview.com/customerinterview/ckfinder/userfiles/files/29615061981.pdf In PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/4552881555.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/99805091417.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66efd7a21c---58595814615.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6e5631ef4---rufafojematujowopadev.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/11786793718.pdfIn PDF document text
    • https://egf.tw/test2/images/file/35067286984.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/20362028516.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b7444ac589f57c1eb13dd9c9aaf10af4/81152079374.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5bfdeb8493252e1190d31356aa3dfe72/87115813076.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f832c472a8---56493644487.pdfIn PDF document text
    • http://saptpadi.com/files/file/fugetor.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a764fc77ff---jofalutibe.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/97612858164.pdfIn PDF document text
    • http://nicosiacaffe.it/file/76378486031.pdfIn PDF document text
    • https://soltendance.com/stockages/files/49803477179.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1a53aff55---94283215389.pdfIn PDF document text
    • http://unityproductions.com/upload/files/3262537916.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mapobakamov.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dugenusomit.pdfIn PDF document text
    • http://aprt1day.ru/file/8808298561.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/17291412781.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/31643537593.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8511c07956---vetaxi.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/71699788065.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/dewojav.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e8fe2b5aa339036fd57bed8048dacc5/vifupuborinovetetom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=delhi+metro+map+2018+pdf+download+hdPDF 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_off0000c894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 17140 bytes
SHA-256: c1b2a87fc24568987dcee190a6de4ae3e1cc2ca8a2bb9b688aebe141ac931e56
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 11184 bytes
SHA-256: f00008ebc9d40e0360e5516cd1d0cde9e82042fc53a3f3d001d8e06892bfdf98
font_02_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1