Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fbcbf5dd396f21…

MALICIOUS

PDF

89.6 KB Created: 2021-07-29 22:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fef6fe796bcb98b8622eaae819d88b8c SHA-1: 340dd0d84be82678f4af65f15bec9ead1da970e9 SHA-256: 98fbcbf5dd396f2122890c7845b06d6d386c24f39b0dae1e7b3cf0af39cf001c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be redirecting users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=what+are+the+3+types+of+compound+sentences PDF link annotation
    • http://zabradli-znerezu.cz/userfiles/file/rokedukewor.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/51306046853.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/noviwagizimipupimebob.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/ziboj.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8fcgbk8pcommbr7bcgri1ortp1/31264585354.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/73562086272.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6mag4vqvrg4so4ldprjcl3tar2/bifimalu.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/wovomakefipowum.pdfIn PDF document text
    • https://egf.tw/test2/images/file/74323434632.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/f7bfeeec1a18afb4b81f9dd8ee5b4e9b/18429574080.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8869a9492c---55108283835.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f33df1e5---8580446629.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2dd58044c---patebelifoninapa.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098adf1370e9---gavogewuf.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/tepovutuxujumofamelibunu.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/34908560590.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/52549110006.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ee8dcd9678935a6d9f1b110a68bab18d/xozebezadufapijir.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff25d8c82---bilakapamonexurikom.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/78ad93e259f89fd617477765cdca8a2c/99114100313.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/balolojovazo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/232dc5aac363062172bab337cef80e27/ledeje.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afced87c92---61991150071.pdfIn PDF document text
    • 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_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 17036 bytes
SHA-256: 61b2b31689049c627a8b0e345e1f07f2d275356d3bb1ecbcbcfe21d81a05e0ea
font_01_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E19 11124 bytes
SHA-256: f5965aca6da21933bfb17bddf66e170bf18431280759f3025cc191abae899ae1

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