Malicious PDF — malware analysis report

Static analysis result for SHA-256 952531de70220fbd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 02:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 041f4d8eae97e2b97c474e67823fd2df SHA-1: e51c1868230dfca3ff01af24721f1a631bb3825d SHA-256: 952531de70220fbdd501f3d1cf855d713d6762fa5d8c101e4b0ae9ea4e065f0d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.lire-les-notes.com/ckfinder/userfiles/files/80230998398.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16145d96689545---11440959233.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/kulevekek.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210904191806.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/lajevogeronusu.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/punapu.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/91011067014.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/xokalamebutorejibises.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/muwasomemopazome.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/36688593269.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/wuzixudazabixanaliziviliv.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a41848f70653d8250f40fe9f0bfcfafc/tekuvi.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/pekezilalud.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/podudaxetabirob.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/budemeruvapetikupup.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/76329851421.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/72596911125.pdfIn PDF document text
    • https://uangraja.com/contents/files/96834524667.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/58685481582.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ud5s0dq5pc4p0tps0oo9f7m2ss/90817596217.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/52156170715.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/pulelel.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/35334199525.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/46158667595.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/sudoj.pdfIn PDF document text
    • http://poiskvod.ru/images/file/45864656140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=beyblade+games+download+apkPDF link annotation
    • 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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 10928 bytes
SHA-256: 64c3a0c27fb7026b48f8a6ed572ceddfed4509b017916367fcf309d183780301
font_02_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16040 bytes
SHA-256: 7c4a9ce78c314b627562b7f57a8c4b050fd2981a47b0d06da990c10f37ce1174

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