Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e504ae85ef46742…

MALICIOUS

PDF

104.3 KB Created: 2021-06-26 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d777ef645c1eea90a17d4baee11d1ec7 SHA-1: 8ef5c83cb7def5cad8e1f2e9768d6a757d9d7f87 SHA-256: 6e504ae85ef46742b43e54301d742405cb93645204e4dca9fec5302f8f56595f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=gathering+of+data+example PDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16081c598642c7---wugudofemimoragatet.pdfIn PDF document text
    • https://aashianarealty.com/file/popijovak.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/36867357434.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb02a09438---70974750366.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1915b4402b18ef93432730223f5f1861/vurizorifane.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2945b472---57142619363.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/h0ahlbnn8qqs996e5nhsgkptm6/5389144174.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c563b7d6a575d9e2581275192c84da2c/zalowekibafaliv.pdfIn PDF document text
    • http://teplospectr.ru/images/files/navomidi.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/40772878262.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768998b4a96---23844966555.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c717a31234d---8927402607.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/20961818754.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4oi3icsqo2p2ans5riu9362ckk/70689878219.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/36411164814.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b6k0g5co8i8v9vl4k7v3vflgg7/48905160257.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c52e1ee0733---wotijinu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4pirci19oobcoouvqgfs6dqsj7/20384763153.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e54657c37---59799503233.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503193128485.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/rilegevizamulupegovu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/mutasuzuvewafopisupomafaz.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_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 10920 bytes
SHA-256: f020853de2a747582ae622d33d7c6d618a98e5d256e5248b8f5752c5a3c549a7
font_01_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001693d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693D 16560 bytes
SHA-256: 972f596641faed50623b61ac04337bb796498bd7cb6f9120f5168adab24b64fe

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