Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93a861d10827379…

MALICIOUS

PDF

100.0 KB Created: 2021-09-01 03:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b496d8a9d74253060110e192fe82634 SHA-1: bb49238f3d3f2bb36a45fe3b5d91da4636ffc292 SHA-256: e93a861d10827379a9c20f81bdeef78e07fceb81db73f53a906ea6153590fdec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates the presence of multiple links to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself contains links that are likely intended to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://goteneplast.se/files/images/file/lotapenazozasatogup.pdf In PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/31290232778.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/todusaderekubuxok.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vufediduxogejiviw.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ldlf4vge62koq7timnjo1addg/kagafur.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/32278863788.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0888c4f79---topaxomekivafizofawok.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/90128059903.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/nikapupijebotu.pdfIn PDF document text
    • http://cke.hk/userfiles/getamijanazewupotifug.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/1f97d6c5984a5c30397a0214b975451c/68836419696.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wexeporipanopanununi.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/24331048216.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a3d72b8de0c878dd0f1dd6408c630f4b/wotixipe.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/robaz.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/19488169339.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/jqcfv33d9s5aglovqrafet03ft/43945471491.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b940b85d0ac---48929280525.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xetufigoxevilizujugaluv.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/sakuvibetojebijozaxuf.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/92675343690.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/80511437968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=authentic+stories+of+sahaba+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_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 10892 bytes
SHA-256: 470828406c6bade0cfec68147ca23473feee5e72d78002f6aee2a6292c24ff2f
font_01_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A91 20548 bytes
SHA-256: ae5c1ed86ab45c170e807f6d6806a3a14e1ece6ec9cb80a6860cb5dafc6f4805

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