Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1873f38f4bf1f21…

MALICIOUS

PDF

69.1 KB Created: 2021-09-02 15:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e66bab423439a6926805b021bd2d032 SHA-1: 830a04d6f086c162fd5d9cd59abf65caa2a69be5 SHA-256: d1873f38f4bf1f21ef35c062dfdf634b4cdefc03626ddafc1f1ac09769e4def9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiotrusso.it/userfiles/files/52488276109.pdf In PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zumoxadefexuniwaxuxek.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3904cbd512---54389906257.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mrefmqn3mfj2klnorkq9i6hm86/19453115009.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/48926691152.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898ddb1d608---wijasakar.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/18481333579.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/xibixeluwubep.pdfIn PDF document text
    • http://fygl.net/uploads/file/071316063706.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ptkikeptj1tuos1q62ho341it1/jizor.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/57888242403.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/14719507133.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74253498788.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/fotesuzubo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5hlv6u430sevd6khe5vqleu9i1/kuputogelubamugeda.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/22b9c875229e197437271016bc1bf3ff/41535595750.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9962af7296afb4cc0a3d016006ab1a80/fiwaluwadelopomipu.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/teruwud.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/xigakafafusetibofajevofox.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/pozaniwonamosefisevo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba45613d83---17921664522.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ak7r4bqt7o77hgrul1b3eds0p7/lebisofonomuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=resiliencia+psicologia+positiva+pdfPDF 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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 10804 bytes
SHA-256: 878889c2ae6fda2c6ae6490fcf8ad3e066b974d6ab4e8c7eaa7b0eca7c3e8208
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 15116 bytes
SHA-256: 28313062c45db4fdf24557dbb73239756224b9f194c040d30c34c030c02910c1
font_02_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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