Malicious PDF — malware analysis report

Static analysis result for SHA-256 062ff950e9ef260d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 05:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b3cf305f8358823cc5200ba30f1a279 SHA-1: 086fb43558183b33c85eba412b06f3524a305f44 SHA-256: 062ff950e9ef260d5e0cee628ea334dd47e33704b5da4e509d1010037396275a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a strategy of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=hill+climb+racing+android+tv PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/dusexoxijolu.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/xowovuvewazopivekovok.pdfIn PDF document text
    • https://alariel.be/userfiles/file/39915916713.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/84044524103.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ribuxuzizisogevawalekub.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/veribexinutileras.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/suluwewokosalovodipo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/26041759056.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338eb5abb3---zevirefizifasivevux.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/66347069817.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/64626058138.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/44295763578.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/zuzol.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/47446714334.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1a91550b---71358496922.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/45545718909.pdfIn PDF document text
    • http://skncn.com/u/files/pawimu.pdfIn PDF document text
    • http://regmac.net/userfiles/files/delazoraxol.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/8948122948.pdfIn PDF document text
    • http://brlairport.com/images/file/10921448553.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnfrc2joj3p21fk8b7n9lev195/revamotufegonozatunubal.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5213b7f8---gewojobifab.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/85513166020.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tobafekugozurazefavirafak.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_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 21280 bytes
SHA-256: 92297cec96711479d40fe11815a75dd9f4884d4c0d55685d2d2549892e6b5ade
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 10612 bytes
SHA-256: 1f8379d6ac61b3ed42a41c18b8864ed1a67614da971e6b0c5b8e07d03afbe553
font_02_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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