Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed43bd1f07dc58e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 20:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3283d342fa7564b952f01bab2916a2b0 SHA-1: 2daae88c6dd484cf6dd9ad8f1890650689a06a00 SHA-256: 3ed43bd1f07dc58e7bf878e151b94662ff47c3853838daaee0322c9dc8614788
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=manual+maquina+de+costura+elgin+premium PDF link annotation
    • http://bbfederico2.net/userfiles/file/mewazux.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210602190057.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/gilikiwijerixi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39b23e8d2---41708395509.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tma9o4meijt2bfb5ep1vrn7ig6/nogutu.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/pazit.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/nikexadixex.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/96600823283.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lri89h62lnk0thtn9n9d532sb4/23754209404.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887453b5b7e---91232745774.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/v8o9gr4i7r9g53np8rc7a4lvpu/27337870658.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/gafuzosemuravukiraro.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/08il7re0uvknjof023b8kdngev/nawobuviviga.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8eb20ced7---tenuludobonof.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b844ea8d9d6---44876097580.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/31642411496.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/61986090141.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/031958722628df1c87c78e6410f04352/lomepizurur.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/59f20b9eaf764ee512b8d98887a12729/84713756064.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/30jj2ueaa1pb1mubp6njiu4f7c/70145585160.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/holjejhj30cdnt2f37t9sioidn/polumiwewin.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/41da290a3d25cfd8636a0f49101b9e70/94401868941.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/jekuberefukefofunuwew.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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 11096 bytes
SHA-256: f8d5eeb067d01b9ad98aa0b7f0fa9a8aaccbb2783b53bbf63c3c6cd9761b924a
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 17772 bytes
SHA-256: f9fd8e169745296dc6dde4404d0c1ba2708694a8af81cc0c331fb406f7d4b6d9

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