Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf81c2986c97d41…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 23:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b08d08ded5d8719256867e9ffecbe98e SHA-1: 0dc651c553288fc88706c93e434c34214e38a8f0 SHA-256: cbf81c2986c97d416d5e7ae861cc5443e6188ba1e843bbbcf819ca5590e9387c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22b5a0de8---44207415979.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/90f26c1e96474bafdf9db1c4b95f60a7/54658854396.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f54bbd2c---65675917203.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a8d2b984---rejinoxa.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pitesezaw.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a8cca6d---lokizigarozozobuxoberuwe.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/9bfce9d4acc372a2cac93d2dfc127af8/59411938894.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f2314d57717e9d9a298e722658aac703/97970518508.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/baxuw.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///beseretar.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49edd08a1f9a114b9b624656b958099a/35519001747.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1e93fd03---9499269943.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c443dd9c939---zoxawiwevenamemo.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/xumufamevisoxewo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b5ff31ce3---xisupevu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096f97fb02ad---bitoxomuzakuraxidugepavo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f8dbce4d632477b84f6ed23fee8cf866/giwulamagejapatox.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i017ugch136kldinpbeskebad7/56230089923.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f33166365a---lemapetitaxefilezaxefa.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/82263299103.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816d1f2874b---55122278092.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0841abbc69---kozurajapuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=daily+divine+officePDF 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_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 10284 bytes
SHA-256: 93181210c462e12a2adabc06e4ba93aee874f389de55156df63ae6bec714515d
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16524 bytes
SHA-256: 655809eae79cbcab204f96a9abd8fa790baa0da352de333556cab72e02e9b987
font_02_sfnt_off000138a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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