Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08b724d962ac7f2…

MALICIOUS

PDF

107.1 KB Created: 2021-07-16 00:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6bf12348c9121b9dbe97def637fd45c3 SHA-1: 38a45607d4f22cef4b9b1f160025cdcb24f17b91 SHA-256: a08b724d962ac7f22c61ce9af6fbb6734620504df455d19be9e4e63fd390d03b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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://a-mega.ua/images/uploads/file/xitijom.pdf In PDF document text
    • http://dienmaythanglong.org/uploads/files/10425005261.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/44924038955.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/sunamiwogotolaxa.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/dubakuxidepeditip.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7a1c0e96c15580e6631de24b9a2eae1c/30189359786.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38531147554.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/rimodifeneroxunusepaga.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f1291b15699acf5f6e22ede0f8ec5caa/bulujasu.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/25579860986.pdfIn PDF document text
    • http://funperm.ru/content/file/naluwipeguribase.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/je8f4vvecp5gjo83e4h063pcm8/99296132411.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/50eb75b804aab35a936c04bae6698d63/nitazazamezifer.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/40119243722.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db871c70b0---61823970822.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/68135566611.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e22474362---31054734478.pdfIn PDF document text
    • http://coffee33.ru/archive/file/47703843519.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c66730a0086---pavekodim.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/93531058574.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160859e7658666---lekufakutazejitade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=principles+and+approaches+of+early+childhood+education+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_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 16920 bytes
SHA-256: 6b42487d989a9132b67c42a43ca6ebdaf47527e981ec4e9c71b7c12f752156d7
font_01_sfnt_off00016d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D61 10932 bytes
SHA-256: c81254cc008389fd1f2893da457b82739ed5a3eee1c8a38eb8f1b5bc5789e1e0
font_02_sfnt_off000186a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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