Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7a20c4c765de40…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 17:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1f74f24643b5e535af075520a0300d7 SHA-1: 5d14dfba9db63d924f036036d58978c89e80bb57 SHA-256: 0f7a20c4c765de40ff484e0a4d7e4a90fc5c4be23b551714ac55136d2ba488a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm pointing to multiple compromised WordPress sites strongly suggests a malicious intent. The ClamAV detection and ML classifier further support this, indicating the file is likely a phishing or malware delivery mechanism. The embedded JavaScript is likely used to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bf1440a44063e8f56b19e1fbef4679af/44174961827.pdf In PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/69549033200.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5lv1vjlqrmfpt4a7gk3panqmoc/tubuwosojilemumaku.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/q1jh3vn97ftfdn6al2734r9vpr/xalexeteramed.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/71760831919.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210804_006C35F9D4C17CFF.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m97r5f7co5oj29gp88hd4ptep2/kumalunusonunawad.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/62026795392.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zapunewepetunewozebisemes.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/79532411864.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6376eca7---63716377468.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/vabamesowoxe.pdfIn PDF document text
    • http://cx-gl.hu/images/files/puwuzebigogagaviv.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e887d06c87---87533291900.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a59b310e4f1e7aa95464a83cf7685345/68898674489.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/82493969487.pdfIn PDF document text
    • https://digireg.sk/upload/fodavu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/65264395962.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/sisixebipokikipegakeso.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ac282bd593b68c6ac3af1c5c3ab018d6/botesedidik.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4aa032bfc1---wivekarawanuk.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b76b7bda---17610849315.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fb7735268---pugezolokor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=belling+double+oven+manualPDF 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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 19016 bytes
SHA-256: 0696a7d437692466d514bc46e5eb2bf7c26e0cec6c1bee2cc6e59cf9c67f405e
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 10584 bytes
SHA-256: dad1fb55acf54e64e4a7440073b348bb8796b57e4445c42900fc3098b4d91bbc

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