Malicious PDF — malware analysis report

Static analysis result for SHA-256 868a96d1a86f96ec…

MALICIOUS

PDF

76.9 KB Created: 2021-06-10 00:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 374059636b8a5caf2e63070000375b14 SHA-1: fa458810dc20526e7add2446439f61c71cae654a SHA-256: 868a96d1a86f96ec799f80132839de5ad22680748eaef627c3ac74c68ed0df2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs point to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. No scripts were extracted, but the overall structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=solving+right+triangles+using+trigonometric+ratios PDF link annotation
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67dbdb018ded97fff777f8a03db4c978/59452612526.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6db9649a---13644751797.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f2eb1a4d---jofapugozubixaxurom.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4da35e7fb3---wifed.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/55798722440.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zumefumibakefigojuligaven.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeae9bcfcb---58213310853.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085438c75d77---51273184675.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/82893162552.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/vajij.pdfIn PDF document text
    • http://ligneus.hu/upload/file/wekexazem.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620445598157.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/441641ee298eeff013a69985f083da5a/kujabarixuronumo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/kawejetevalagej.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1fadea4594d70709239ca56225a0c9e4/futimisug.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1t0v6grjvjlrqp0pna4484tuu0/92661561137.pdfIn PDF document text
    • http://firegallery.ru/img/upload/38687452607.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/757c7a9386d55868802a708cc3613510/vixuzozibakojefezugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5376 bytes
SHA-256: 445f44320be2600ace806a15620d58a443903bd979dd8579e048aa2cd3934504
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 11580 bytes
SHA-256: 564ce7c55a77673900c2af01ce276ff064708f41a62712ab40519311bd66cadc