Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9b3c06cf4b4534…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 04:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 630b4c1cd5ef0a0e1476912449218d76 SHA-1: 93febff82e8bffdc701f6419713eec94e7c4f1b0 SHA-256: ca9b3c06cf4b4534d839cfc1859db2886cd3f795d3f6cb4a67e04dc9ab6315ee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many URLs hosted on compromised or disposable domains. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=k+means+algorithm+uses PDF link annotation
    • http://simkoongschool.com/uploads/editer/files/1503468647.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/semofag.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/jogofodunusifigevopa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5b850bb0eb3d15cb28c7fac68090b312/28115023965.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32862353379.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/lozodez.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/18473778408.pdfIn PDF document text
    • http://iccarrentals.com/files/file/bovivawujosebimab.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4f6cb786---25023942865.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d7746a55---jodavikazadot.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/wolilib.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rojukonababebevuwojusew.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/renugaligovegisezatiwupif.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a41733a7---96003965422.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912075651.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nuruxen.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210909092749_gg4pd2.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/92794158163.pdfIn PDF document text
    • http://paliukenas.lt/i/File/wulinowosanugunipezirasig.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/37168904917.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/9586535585.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/vawajogiresawigolop.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/saboxatow.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/35154256851.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/gudalomezizogod.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_off0000b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 15976 bytes
SHA-256: 63de5d200e68994eaf7a2606cceee74c2002e4d29dacd79e8a469172731ec7b3
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 10648 bytes
SHA-256: 2b1b2fa14fac710e5ecf7a81bda766621fcc4386ffa8cbe5289eaa83be22155b
font_02_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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