Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8b8f91fee05220…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 10:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fded70b9ac1305d1383836ff89600ad1 SHA-1: bc9417cd6d85f7cfecb91ab1a915c34c2eaf69a3 SHA-256: 3a8b8f91fee052204a1d90e7e4e997219bfcbb6b85a05fa3f147b467010166f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a 'utm_term' parameter in one of the URLs indicates a potential tracking mechanism for user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=harmful+chemicals+in+mosquito+repellent PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0a19fc19---50397737142.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kbvb7cearmkri87hegu43c09r2/76757998083.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/178c00277777f10aada3f5931722d6c6/dilumujoxagajixalaxufe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a797b9e0---79902015372.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/fapalekobarijuze.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9j13res4n74amoj00felqal7b5/vareputigasusajeber.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/70893487501.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079080aee045---31756718032.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160708c04d8e4e---15726806980.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8aaac226---8134480661.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4d1a20dd878edc36437c4a3181510ad5/36321604768.pdfIn PDF document text
    • https://zold-kommando.hu/files/8817752997.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210706064734.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/58640334543.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/825e5585cad14dc5dc657e225e15e6ca/zodiloburivusutolijixenog.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/46419615924.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/fiwokiwidosawap.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c2t36m9brg0u3k4ihos790bmua/paforenawojuvivojew.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/wukowufelode.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210629215132429280.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/sefijulineb.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wamopux.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/28172426118.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6un9q0gjqr9emr0sts3hqql5i2/19334153505.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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 17696 bytes
SHA-256: 0a1998c111df2cbc151fe7b76f9081c34a5d629e3f3bc4e701abe395af6ed8b9
font_02_sfnt_off000137c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 10980 bytes
SHA-256: f6b6ab479fb907d572db3c723fc7c5f199a415b1763b470cfd841a8078ab7eea

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