Malicious PDF — malware analysis report

Static analysis result for SHA-256 711250dc9fee4e69…

MALICIOUS

PDF

87.0 KB Created: 2021-08-06 04:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e1e2e3d5a064a97e0dbb163590a637f8 SHA-1: 71aff1206a8d17cb90ea835d062b83d18cf1645b SHA-256: 711250dc9fee4e69c3ef66a68ccd28b42d7b91bfdaa0e3dc10b0ebeaf2ad56d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gitedu.in/ckfinder/userfiles/files/vubumewebadofepot.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b1579673afe5f9d996233cca143ac019/5008792095.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/48161211666.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6bf0d6dc---43326047298.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c26ebe45804d85d63c6cd49edeec8595/60261014141.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160911ea67001e---12541771369.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/luwameduvupenidokizexumi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rf7786341kdai2djjtrnd4f4u4/xokixesona.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca65364f8f---6686715598.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uni1i519jhjbu4o35e6gr6vbaf/48736030210.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2e6b3c4dd3712cd5cd5d038135ba7b8b/kevapagulez.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3bqckpsao6cikgeeaejvajec8c/24326622167.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rjd01us2rftgk9ruc11k8gh6bg/667498160.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/potirameni.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f9dae28f---jojigigigaradivapod.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jj0vho0h69g2m6lifcopj02bq0/65122403799.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb637766d---tizuvosiziw.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/webusosisagofobubivewim.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/53169602698.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/kokatuxudoxizisejafuda.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/54768950560.pdfIn PDF document text
    • https://kueapem.com/contents//files/65482331422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+crowdstrike+falcon+windows+sensorPDF link annotation
    • http://irodori.kir.jp/files/file/robolatizerisexokiw.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 17552 bytes
SHA-256: 412dd389e3cf45ac435b923e90f10b9dc9be6ac5882bde143509843c5f94d29f
font_01_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 10744 bytes
SHA-256: 0f9bf64c76ebdc644ba1718532ae58ab59407eb33bc528febef8c1ea740ba939
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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