Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0156857958d45fe…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 06:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac72bcab0b583471a178ee6aca7cdb45 SHA-1: f67ff2c2d94957de38b69650444ec50255a2b52c SHA-256: c0156857958d45fe1bc287a6f76294c8aae6cc98c31edeef8e7c17d5542ced16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features multiple link farms pointing to potentially compromised domains, suggesting an attempt to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://yksskj.com/ckfinder/userfiles/files/damamosozulupafogi.pdf In PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/37459092457.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_040458.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/5400523123.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/57871237234.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/41318924577.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gonirunugidurabemirim.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/94465857683.pdfIn PDF document text
    • https://nevisnews.com/userfiles/65930005252.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gamojizijusipozoseduv.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/1355ba4ac23fbe4ffe2f83a57d2e43a0/noronifadesor.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613724525973b---kasibipetezusesokeli.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/futozugewefonubezejip.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bf7e35e5832bf5d9924b8f178d522f63/pomenurinof.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea510acec---goloxuzesafi.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/lufawubozibo.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/92417442626.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/repufusofuko.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/10624966143.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/19951969900.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/12208930643.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/wutaweg.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/94644154996.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/xivomigilukarujopuxosix.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/62194523337.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/68853871062.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090313571373499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=i+am+out+of+words+meaningPDF 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_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 18504 bytes
SHA-256: 0236d968aa1b0c14dd079b8e43fc672f5af8a8dc68486e53d4c725be7513ba23
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10788 bytes
SHA-256: fd13205e4a99a23e0f06d2ff014ea064c1822142eac721252830c008d662dfbe
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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