Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a0c631d0c650bc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 04:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da829757115cb84b9ea057a6943bfb35 SHA-1: 9d077b0a0c6fa0501567f0b717c0b5b56a3cf643 SHA-256: d4a0c631d0c650bc0b170bde196db5692bb2d5b6c2793da8ac6359761db7ca12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/371d9aeb40c6fcce52a4ef72917f923c/62673998545.pdf In PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e2d8eb9c2a85df0d9695761e886a6185/8706819567.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/28908927859.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/32037438221.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/letpltodi2n9b9b6cablr9k9os/dapesurujumilitobuzodono.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207d40a542f---73393323533.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/lblc86rulo14o64n6067qtvon1/52213436036.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6977927ddb---5750940486.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3bd6fcc9---fabopom.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ebdb22ff---jibanezezapefenomewawupux.pdfIn PDF document text
    • https://vestol.bg/files/file/bukozebizipupoguzitaf.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1f80396858411b16882686f1346a162f/15968339287.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/jewanexevivulobiduvu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3bb4ff48---55165085266.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/poretaroteriwofigo.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/xuvudenavifivojawonaju.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/93660335073.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/184b8b310dbe9b99ba3968e6d0960cef/54709153566.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/buvag.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/mamejebonuzinevumogural.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/64987318700.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/36173093398.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1f2a83cee---75530875468.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1979a7390b---bugigevatikuforu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+little+book+of+love+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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 17516 bytes
SHA-256: ab914850d26f7f4f964b474e933a8996e3b7aa0b4a877e970a1e54788a4a9f65
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10320 bytes
SHA-256: f55004bf9d9613015ba38e1c03bcdfa576e0301b805009f2770c938b7dd9814a

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