Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff221d4e5ecefb8f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 07:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a906e6ae7b582dbad2db06233c1cd5b3 SHA-1: 93686544e09c4a4760b1071eced9f39094bb74b2 SHA-256: ff221d4e5ecefb8fc257ca3b38abf988584a268e2fc1a9199a23297f4a4794b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be hosting PDF files or acting as redirectors, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=subway+surfers+hack+android+1 PDF link annotation
    • http://ceraunavoltapizzeria.it/userfiles/files/17655611624.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/67531528756.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/21780455860.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zudeleragopapumotasa.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/1399314241.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390edf3fdbb---viduseb.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/38867544056.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/52805250270.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s7mn0ptcqu8vd34s2murj13u8n/wugujapi.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/zijuxukuviwudaxajaguf.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/muzixulurudevopefop.pdfIn PDF document text
    • http://debten.net/UserFiles/File/24952738237.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/15762709117.pdfIn PDF document text
    • https://viettrungson.com/media/Files/99149885874.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/tademigugoxupexojisuv.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/51001951669.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/girebune.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/12934722076.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/15682914296.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090812495211.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/34763960156.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/khngqcgr0jdf0dnf52bqu31v35/wosuvakefabiwasokujuzike.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/26677521897.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/21033241505.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/jibejukumuxometevo.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/47150266301.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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 11088 bytes
SHA-256: d4aef48c8de62a4f854802dcc8e804faf38beff6a28a82ed797aebcf2c1f168c
font_02_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 17584 bytes
SHA-256: 63164ed663b01bd9085e72759f4bd9c2796cda1e5816875d928ba6a43bbf789b

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