Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0abbc5e434b3b1…

MALICIOUS

PDF

100.5 KB Created: 2021-07-14 05:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a48ed448f4b41f0404f4b218c8bed454 SHA-1: 4f215b17e6329d33d2ab940302cae314801c3762 SHA-256: 7a0abbc5e434b3b1fd5a3add0e76dd6471764ac3a80a72e6378ceb10a8d3765e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple websites, some of which are compromised CMS uploads hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing. The presence of external URIs and link farms suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://yarpaket.ru/userfiles/file/satedepovanopudo.pdf In PDF document text
    • https://mldom.xyz/web/img/podborky/files/62572692562.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4b69ee9b---80904169889.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/26726291254.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/287af77b1321eb5f4085457f95346004/jodetoneferumavuf.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/82042154743.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6173077d1cee8180a779ec7a2bcbfdf/68677074842.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/6306519623.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/43400403171.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a6b36c909b635f5e76c6760e60c15105/16204304308.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8bd6046f2b400221a7486d46f1752546/75133469884.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeddc0e8c9---ditopobolarobotinud.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ce6b7014---lukeg.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/88355657222.pdfIn PDF document text
    • http://blueyee.com/upload/file/130430259181.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/98109582493.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/ridowoxire.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/81159301148.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/71997941118.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee37997c8fd---pizunuwofarezu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070c320c617b---79274406149.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160840b4e71176---kenunilifub.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fdebde07---fiwoludexen.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b222b447d2d---82414179937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chapter+9+outliers+summaryPDF 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_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0F 17560 bytes
SHA-256: 8e2848c41b583038fc30db7df469da63ad7ac70b33122d6da3d47373b69acab6
font_02_sfnt_off000169fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FB 10824 bytes
SHA-256: 0bd849c368ef01b1d438a69a72d57c62f7351a681eeed45bdd8db89f90492d7e

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