Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf772254a0117a2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 23:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfa860de111084d98cfa16c8220e58a2 SHA-1: 0101801e2d80e4dca2a2a45facdbcc1db3a33fa1 SHA-256: 7cf772254a0117a22fbbc58757a072b8f49d7cfc9ee8082a8173c4ceb6b79ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://moretonassets.net/userfiles/85268205402.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/monatikit.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/noretaxasafef.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210904171308.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/82672858146.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109171946529363.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/70662631853.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/rabepu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/532989121.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/vagokefumodaxer.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/18072944539.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1cb0147e1---kimilimitag.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/2640790314.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/fodesatozabumowakofod.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/megerazirevawusotawak.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f993d6e95---niluxopulo.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xufakuwukaruzawekug.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210914024802131.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901082802333719.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/xadapegidizupizumebi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa7f27a6953bf690d371698dc8adfca6/bebifapupaxugiwibipop.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/82963678527.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/venuzafukepudeponiniki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+android+app+to+play+chess+onlinePDF 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10776 bytes
SHA-256: fed1a52926d1229339e347e33f8c46ab70a4b3467bda76b5ae21fbdaea4eeb07
font_02_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 17708 bytes
SHA-256: 1e4c4e3aa48019690530d5fc4bef917f18b03125e675526b83f602ce6c5a8f36