Malicious PDF — malware analysis report

Static analysis result for SHA-256 576391392f63a45b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-22 03:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf0b23cec5a3f2141b63895a07cd0806 SHA-1: e8265e04aef4e799544446a7c0f73c3cf979275c SHA-256: 576391392f63a45b590ef4294417671021d00a35a8deb5c4a7168bab521a636a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV both strongly indicate maliciousness, consistent with a phishing or redirection campaign. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9f1fce2f8cc6e33315f107957803382d/jokulonute.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/43418368150.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/repaxiwikaxi.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/29718004372.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/50334799999.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5956ebe93dd6e3437f07025e6c28c01c/natuwijebemiwewin.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d3i8dj19am0sgb3p0ofagme131/95841816890.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fd1f9a6ef---41269422993.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/26945365580.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/15066248078.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8e5564ea---malumukibufu.pdfIn PDF document text
    • https://ijp2.com/contents//files/zurodufiwugusetadi.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/duziguzisowu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f285a0e5d---kokujuwofagodisulalo.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/523402514609b93cb445d2.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbd6682a175c7796dbae49eb3e342f8b/86573435056.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a195c19a1fe---75481198166.pdfIn PDF document text
    • http://one9five.com/userfiles/files/1230190834.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608299060949a---susiteza.pdfIn PDF document text
    • https://securitydm.com/slicice/file/8178012024.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/88338036005.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0185d091f437d30e9cf224d0e637f855/dagekiligajowo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbe795e1e5---jobulezuxulojilikomotinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nebo+slyde+king+manualPDF 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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 10816 bytes
SHA-256: c8382f93ceaf650e3331e17d44665f6b38d53343019173355030838eb88d2456
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 17064 bytes
SHA-256: 35c25ab808d3926851032ac24062b3ccf644cb33640f016721f5dc189c0197ba

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