Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b752bb3042f936…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 09:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 46c60fdd6533a0c798176b517e14a1f3 SHA-1: c1b5f9fbbe1ddbe2abb07206583de23e1ccd9444 SHA-256: c0b752bb3042f9367456123f5d00ff2c4b127a4092cb2e538935d29d14b41aa0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for distributing malicious content. The presence of 'wkhtmltopdf' in the metadata and the ML classifier's high confidence score indicate a malicious intent, likely to trick users into downloading malware disguised as legitimate files. No scripts were extracted, but the embedded URLs and link farm structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/uplcv?utm_term=geronimo+stilton+books+pdf+download+free PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53416e142---51254549609.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/7054984722.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/87269510244.pdfIn PDF document text
    • https://wecareprogram.org/images/file/3264046823.pdfIn PDF document text
    • http://lyshiying.com/d/files/duxadaxe.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c67f776cb---38037856681.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/77944771082.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/50d82d2b9898c33e4d3f6474828decec/mabazegawuwut.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/58766943967.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e68d5c9c33b3350f8de21eb06e1d687f/juperuzipuxibumuwadap.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/81253648244.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c83a4994507948563e07143e2317ff46/pezuvipajubi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wiforexat.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hlgaff1a9cmd2tm8trcetiq9f1/6271928349.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/86945869880.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfa8393b88---fukonobujoxajezagonafeko.pdfIn macro / runtime command snippet
    • http://eau-msu.ru/ckfinder/userfiles/files/80791108319.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/37d3dadb64ce9aa9c920871a6815b9e9/venaxixarake.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160884a2c4fa0a---78328578.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/tivase.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b533fedf0364422ceb28576aadd00f9d/56551566280.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853daa5fa---87021694633.pdfIn PDF document text
    • http://grandinhr.eu/images/In macro / runtime command snippet
    • http://e1pl2.nazwa.pl/busy/fotki/file/viremoxedomid.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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 11016 bytes
SHA-256: af4de46f085d93ed6ebc28346a9e703e875ad72e036ced60d52423f7089ee585
font_02_sfnt_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 17308 bytes
SHA-256: 375d5bdc347e7afb0528afe8ec4a6871b30c3ff5fe46eb167ffc595abe79b405

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