Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3e1ddd9aa68c23…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 14:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c680c4f54a03313183ced6864172f51 SHA-1: 70c6a6390d0ef6f24b5f1f4a18a40ebaff4e71f2 SHA-256: be3e1ddd9aa68c23c1015b0a1e094f7b330fe84679ecb2b2e95cabf406519dc5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links, a common tactic for distributing malicious content. The numerous links point to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fluffy-chins.com/images/file/febumezadaxotex.pdf In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zewenoperejubepogujoji.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/5913482697.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/28059726570.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/zakilakilevaxurupume.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/91158874144.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/37577121697.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xixaginudipegewajotisujam.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614239883dd98---49177693322.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321512133.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/wufor.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/watefoxudef.pdfIn PDF document text
    • http://congtyvima.com/images/Download/fagexafalapomozito.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/gudusonazeg.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/waromugizolujokagazirazak.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d642b622bd133622bdd76a29eca8116c/61152337969.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/6721542216.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siguzemusovaribotelak.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/noxetipotitilexisiwinabil.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d77c6sgb5t0hnrla2t2tfpf1bj/risepasebuvajokisa.pdfIn PDF document text
    • http://harlit.com/upfiles/file/69471043168In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+download+free+ebook+for+androidPDF 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_off0000b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB004 10488 bytes
SHA-256: 147048360ed4d77273a702f23e4c897a0502eb46f8b7c9ae341f13bac7f7d9ae
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 14060 bytes
SHA-256: 408806a13889734897e7ebfc03e6d9cc8152b42eac3e34da34378f4282b8c835
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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