Malicious PDF — malware analysis report

Static analysis result for SHA-256 069a6de97eb78969…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 05:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 995b9ce202c7717e060341410c865a28 SHA-1: d87332e9bb320cc0fc60853abad4f09d6e6b14b7 SHA-256: 069a6de97eb789698093c7daf6f57dcf0cbb59974026337aed25ce4eaed1d073
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or phishing lures. The presence of multiple PDF-related heuristics, including compromised CMS upload links and disposable hosting, further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=transf%C3%A9rer+contacts+outlook+vers+android PDF link annotation
    • http://mopron.ru/upload/files/nejewes.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/55910840961.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/18370824850.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fevoxavifowedusewumu.pdfIn PDF document text
    • http://espokebar.com/uploads/files/garasabasogi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/26803801226.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/liduxikozotokigulixilunug.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/varuj.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/24628631766.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/44647044542.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/dusofotuwokox.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/aa7f77df6520e10c6aef6377d2a0cb57/73199333872.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210919070025.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/81141701428.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gebotefes.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109210159108629.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/cfsarh5b8ujri81qkohkkre5i9/wuzaruzixewuzizuzupexu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/193647f99ecfc08f80d79ca49c7ea18c/71327758167.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/68810769634.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/74084107581.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6133edec7dc08.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vafiras.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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 18368 bytes
SHA-256: 39fb2a0de178acfaef2c9d1ca2b0c14c3799a32299a856a4309e34a141dda687
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 10844 bytes
SHA-256: 169dff371895f03b2f424d2036ea0696c47ce5819fea7afb9c29b3eb9545bf82