Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fbd603ad7ddefb…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 03:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 079cafc2051f2b21b8c5f54f5f224a78 SHA-1: dfe664afa2b7ddc80a89cdb29b44590f733832cc SHA-256: 73fbd603ad7ddefb0de9aff1ba34159f87aca45925a91518220a5b1ecdc39a8a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://thunderstar.cn/userfiles/file/20210510062251221473474.pdf In PDF document text
    • http://suttonoakfarms.com/clients/880813/File/lipomefebugagefemubabisa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mt4v3jl5ma6lm9v01pnc8dc9uh/5553945018.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tvlabdpo453qca019lo7st96i4/19348284214.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jozovomikesiwavosabo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/namivu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/84a4785ee58a0705bdf1e89df591ae9d/58414839162.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/i6g5tn0njlticfijpj2r9kik7k/jukofek.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/53307838380.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///346434946.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee5b79e41---sivunenixadubuzifot.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b199b1633---jivonamaruneme.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/12r3qgun2qchrcj70t830vhk55/74643215975.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2724fe07---widilisopudefigedagugavo.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/sujutidugari.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/digesuxanon.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/009cd9e73cb071786e63f2b59055c15a/rajavolezivosaki.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/59f9a117d76f4fbc051e3a7e6c727fda/mijivepo.pdfIn PDF document text
    • http://yulintimber.cn/d/files/fuligiwadejomag.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/23075923358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=drawing+a+person+sitting+downPDF link annotation
    • http://irodori.kir.jp/files/file/35449416492.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 2900 bytes
SHA-256: 693c121a98e62f8d167ee47d5d2fc935f0e2f4482c1f3c4aa8176911bf9d5d50
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 17312 bytes
SHA-256: 6bb56fe650d9b5757cebb9e687957470c13b673d0e40d1d6028712e6759f7a9c
font_02_sfnt_off00012b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 10608 bytes
SHA-256: fbc622915853a9f01d0748fd4609ac1589f1a379c7de06b3fa485e0487ca2883

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