Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaec339bb9afca40…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 02:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17ad6d32818a57085d6c7d2c69a92786 SHA-1: dcc7bc71d874bf47d5b93bea171ef7371dfee4d9 SHA-256: aaec339bb9afca400807e348d6e6cc7f5b3139715343d2bf2910292640e5f572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to compromised websites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or a malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=xiaomi+redmi+note+7+slow+charging PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f4cc6358---72658385153.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/wiwakunefafipateres.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/zumekepolifo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cae80f0b4---dopogute.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/roxatipuwinitiwaku.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/93706105877.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/duvidevawa.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/13898123838.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/5859473152.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/13042564242.pdfIn PDF document text
    • http://topstec.com/d/files/71799976992.pdfIn PDF document text
    • http://nessium.net/userfiles/file/18316603728.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gotukuporabafomiduvum.pdfIn PDF document text
    • http://cjatkinson.com/userimages/nujetitesaxirariripafefip.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/mizatepumi.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/takakafoxuvav.pdfIn PDF document text
    • https://wildnaturetravel.com/File/95829153725.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/82396491899.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/94697255913.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/13820220065.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/68145068270.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc683d706---98300029560.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7cuff8tnmq6mhjs3elsoic0t71/86053476095.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_off0000ae1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC636 10960 bytes
SHA-256: 027514fedd686358415db77a05a6a27e368513d24bc2cfcb7edb0e5fbee6213e
font_02_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 14468 bytes
SHA-256: 2f66623408710a1327a67963e18c4b42ceed721bcb1ecb4b36e28cc9aaaa380e