Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e12469ab79aece…

MALICIOUS

PDF

74.2 KB Created: 2021-10-02 02:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e289bf2b20d353ce334b4e4abe71cca5 SHA-1: f798579c2d28f82edd269378a2339855d7423347 SHA-256: 07e12469ab79aece9ddf0c92581eae3143ab7454aaba9217358fa6c215feae75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for SEO poisoning and phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/43478915807.pdf In PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/27907187728.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/35403579405.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/bisesutidusefexalisax.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109222107002228.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/xopixetamefete.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/wagesijodevuv.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/zefovomu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/kevukipasediromu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0u4jed91cim8aehetnscqt2hpv/releloxixe.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/29693860185.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/86131603959.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jewekefosuvebo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa7a3d20---notinijutuvawoxeke.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wakaxajejakus.pdfIn PDF document text
    • https://mackbeks.com/files/file/79129799798.pdfIn PDF document text
    • http://519pf.com/userfiles/files/54783381709.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161313d2b596fc---rutigezekebewu.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/degezagiforotoxep.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/nogajutad.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/16746892797.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/4137607035.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1d985f0abf7abcf5cb34560f6fff515c/14442857591.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a464f90---23344718933.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/49501444461.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/nelosozepedudoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=exploring+microsoft+office+excel+2019+comprehensive+pdf+freePDF 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_off0000b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 11520 bytes
SHA-256: fb0a3d26aca674c4d085b4fb06abd53db779771f9495526d936ffcf3b972c828
font_01_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 17392 bytes
SHA-256: 82dae3974f18cf71d99870c0ac39c3f35e69f3535b6d236084605cf27aa84de8

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