Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f7488971894948…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 07:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e87faca65bb3a442abe61a75ddb312c SHA-1: b15be8e9566f989c3d010b78d5c79ab1013c08eb SHA-256: a8f7488971894948e733edcd6feea09a5092a2310b4dabd39bf8d59c5f948781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs embedded within the PDF point to compromised WordPress sites and other suspicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with a lure document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crysiq.ru/uplcv?utm_term=perspectives+in+sociology+pdf PDF link annotation
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc0cc3720---jetowedegob.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/dadudexubexuwax.pdfIn PDF document text
    • http://contactconfiance.com/files/files/35168088873.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/25265181481.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3598088e02---29367023521.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a49cf3af03c392c6400875d4ebc509db/jevatima.pdfIn PDF document text
    • http://willbramephotography.com/laweja.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/4444470645.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/ritekosoluwubufi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4f9o64fkbsqlpvbs3bh6ai23m6/napemanolapelepibaj.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/gubune.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/duxoduv.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5d4796c660995342e2e3878d7058be9c/45561633465.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918fd62494---telezegamodunosudegez.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0ab85e97d---katesirenogugevafakiv.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8108751490---gosotutaxatoduji.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087afa744b03---jaxugaxig.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0v43kj0a8g59nkrvp5tr7ssmud/37775605168.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/9179605305.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/69834317608.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0t8ntsn1ckea067a8mn5olh65t/kazot.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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 17596 bytes
SHA-256: 6aebfef07109d71bf44641e86396bae41f7df2a1b73bef8dbe4013a5131d0c96
font_02_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 10816 bytes
SHA-256: 4f299905b7f2944fa2d6775a3e64e21c936bb2a7552682a02e6135a454c7f056

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