Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb66d99efeaa31e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 19:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe6d52a0ca560ffccbb321045dac75a3 SHA-1: 38a095787812ea7cc547debc4c3ed6fb51856dc9 SHA-256: beb66d99efeaa31ed5deaac802fa1ce50fe1c96004084216f459b3f105a11292
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'cmd9ga63vh7lthlrbr/6075188814.pdf' in the document text and a corresponding URL suggests an attempt to execute commands or download payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=telegram+tracker+mod+apk PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09fbabff3---pikojikeweporegumodusena.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/23727905390.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/zibifatenaxitawodebuvow.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/57362513133.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/posevisi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qol88hb9cmd9ga63vh7lthlrbr/6075188814.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ebcaa4b4---68838701058.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/62960397760.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/torutuvibuxawo.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/90232186674.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/wagijadadoxutoze.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/pekitefoxumolaxixopob.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210913143841.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/45377360626.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/sagizux.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/bitawaxuk.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/94656980300.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210902100819.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109171054486490.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/rimeleralajar.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/tanujeguzuxonuvukitawofa.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/94779083215.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/foforuwukopilar.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/18130934857.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613567026deac---bufapesew.pdfIn PDF document text
    • http://festivaldeliteraturIn macro / runtime command snippet
    • 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_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 17316 bytes
SHA-256: 9aa97c559c4affa7896552d98b38cd0e25a7658fe4133c6c6c08d8a757b7078c
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 10548 bytes
SHA-256: df16960fb35076edbf92f6f7788d424f0fc1a9ab7e13f7a6e9f96c35eb266d7e

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