Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e29c5288fc0cc9…

MALICIOUS

PDF

108.4 KB Created: 2021-06-15 15:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c0d87812c8a24c7d2476364b40ae2472 SHA-1: a95eedaedaf88b18dcd3358f6de52a196d1462af SHA-256: 71e29c5288fc0cc953aabafc8ec2c53975d0f2222c24320dc4b548bb08566a3a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=kung+fu+panda+3+tamil+dubbed+movie PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b3ccbc7a6c0de8a28ec7c5c6f98278be/73606469376.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/42qscnh4gvk4pudepeou29hl0h/dekomaseri.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/50757013792.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acebb4cc7c7---81872389923.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/52934741355.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/212b7e91e8cf45c5b221e7510be73c9f/naditivovapekorabir.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rurekagasajosotojejowuwu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47169215ca---22801286042.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/169525d3eccdd17669c1709ca5b0cf94/32568008626.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3873811ce---wamezabokigenabizep.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tuxomosotenijetite.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/90027797450.pdfIn PDF document text
    • http://short-story.ru/upload/file/zutewodopekuzilidipid.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608462a5746f5---buwabunerizofesumemaral.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/vufisalapina.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015cc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15CC1 12824 bytes
SHA-256: b03857f2bc7dc30ef8ed6ee9678706d1c7b5b7c16b0ed1c8aa18f64dfb182856
font_00_sfnt_off00014a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4C 5420 bytes
SHA-256: b48e51cc8e1d43f23efd6d66d4271cd8bb0ddc6530ca4d27f10c66f4722fefb2
font_02_sfnt_off00017c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C97 11476 bytes
SHA-256: f0ee263ecd95a01ed818ed02755f6096e15b960b151edf655840f209bb64f5d4