Malicious PDF — malware analysis report

Static analysis result for SHA-256 4771427aaa0e31e4…

MALICIOUS

PDF

94.2 KB Created: 2021-07-04 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f40a8cce476c64c2772ebefaabdeed55 SHA-1: 0259a983e5e337dd5409f2f039b18bc162dda225 SHA-256: 4771427aaa0e31e4079dc3884aeb189aaf05d432631541cf301e5ad0664a69b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=barbie+and+her+sisters+full+movie PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608199efb5255---kugorabudezuze.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/34c43fccf0083033c69c0e654b1898d9/felugumedisiwok.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cklcg9fvclen00bksvtosl0jd6/55229654813.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/56542195505.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8bd1f35d4---46788406668.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/aba98e90857091c9e46e79cf3dceb341/gavog.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ithnnaa4r8lg9h1lirlhhs5027/gumegunuwowikelemiwesopet.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c896716aa1add367032f4c6019113058/fijuji.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/pilojori.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fonukizo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55958795f---pemoniferegekapokusot.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fb713f68---84973196452.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/tikumogajajipifikugen.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/retisugoxajaxusiba.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/44b8d900dfc574dc93541d08fcf12c97/tokijo.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/83294702492.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/favofarelukuge.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eda0f0e75d---tuxax.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/99191258618.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///82642106749.pdfIn PDF document text
    • https://andrejc.si/files/file/25299525226.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd67db2e16---48490916686.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fef6c8ee---21235788451.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/90719091127.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/zigisiw.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_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 18904 bytes
SHA-256: 71de5ae2fe17fb81969889f27ca9ded9639e4200354f67e7f43ac4f61fd60eb7
font_02_sfnt_off00015232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15232 10976 bytes
SHA-256: 36b355cd8a3185067e385559ea6e770feafbc51534cee3ae25432ecde826b80d

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