Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fb27ac88b9c48…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 18:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 847fcf9b88a28a71bbb2178854cce6c9 SHA-1: 9e8885c3b7c98d3b7ef8b32a5b01695a5cd800e4 SHA-256: d56fb27ac88b9c4808ca75b845518b3240500c3aed715931c4dd6755d06db5c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on compromised or disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://24emk.ru/ckfinder/userfiles/files/31972012652.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d89a14b8c2---5706679920.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/61733669538.pdfIn PDF document text
    • http://dkind.net/userData/board/file/gomove.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916c0da79c---pozujawitibupowawamisor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6542f5d9---zusakaxugakitexuvububib.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/tofuko.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xosivi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/54474792504.pdfIn PDF document text
    • http://armanetti.com/images/19549542140.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/jibesitadevixojevoseporir.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/92775706425.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/fewudigasij.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3437ee3965fe832d510df910db8d7d/78447603185.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/90227431671.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/69754865909.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kimibifopudusabosim.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/84616157347.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/76914018845.pdfIn PDF document text
    • http://ternovykh.ru/content/file/xijorasulekuvizosakipemo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3aa33a766---ninunakevuzonanixepomaj.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/dudele.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/mapuvixuzojo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140afba742e5---34099259283.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/rutulolekopupires.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/93101380708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gunnar+myrdal+an+american+dilemma+pdfPDF 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_off0000c0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 18776 bytes
SHA-256: 936c8a28241622988bed3b9beba445028b025e1777f05efeb4e102fa88595527
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10648 bytes
SHA-256: 257e4aae431b5adf210ceeb4a7936613d8a23c4cd8fae516799b57e1571d69d3