Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3470a2c2985bc66…

MALICIOUS

PDF

82.3 KB Created: 2021-06-29 11:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e6d9514bbbdec2b9dca2fb40b8d6a6f SHA-1: 361f67c6479af27474fff5f8e2e38da11bb86624 SHA-256: f3470a2c2985bc66358b4c8939582da4e065ee8d61c383f84e240357d2a26d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirector to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/96c50ac3f62581289ec0e3aa2b2b6042/tazisefitugij.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6c7b4b04.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be45fa79f28---86989041728.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072561219e50---vifejofodu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fa85d939---lobuxabadugomenovur.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/kmrrods68rp5uni20a6m5v8gk8/14259146275.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/87342899986.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dufonixujuvuletonenixote.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eff1d4318---29126308240.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb6088130---77037657457.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/xujimekunonavebesik.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160920804953a6---6286705374.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/51885866374.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/navasojidofowo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4edaa9a2---27335360748.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0359ceb0f---75497244943.pdfIn PDF document text
    • http://www.puhito.hu/uploads/5881288072.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/60397969321.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/mimobujudipegoberadajisi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca9db7dea---3516081511.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/81133e9544870d1a5e49db7de6c93f87/xuvebimumoxegifopimilet.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607353de29cd1---61095171506.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bivikikenobizawelokokiwib.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a05da69c625549427a69cd5c5785613d/30970084449.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/006a5ea863599525be3e703115d677a6/sapusovopepod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=i+wish+i+was+there+with+you+lyricsPDF 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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 16964 bytes
SHA-256: 25086bbc33f264ce2948bd47e2c158ae0a5e3be827f7c6f1090360f7601068dc
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 10476 bytes
SHA-256: 900f04731e205cc4fb920a941f4b5db2efa927a4e5de6a552a121700ef585c00