Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f4a22d6d0a521f…

MALICIOUS

PDF

85.7 KB Created: 2021-08-02 15:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c02570a8e5b0e3eee4de79911e352fb SHA-1: 670d83712c22836bafebdc53665a804248f61653 SHA-256: a1f4a22d6d0a521fd8f79c0d8c094efe563f648bbb9fae678dcfe53ef69a8a92
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload directories, specifically WordPress sites using FormCraft. The primary goal appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7429030843---napagizadobib.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021516527397838.pdfIn PDF document text
    • https://anjingliar.com/contents//files/23543606033.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/63559638760.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/50706155031.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba25760baf9---25166686480.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a9af680856332ce469a9bc2bcde1093e/pulezigivasibu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608441a802d45---42850518018.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1m2252jooq4nvoq4rtmj1kmj24/kudunujejog.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/78082073477.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/86600919206.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997a8882dc---13779638112.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g9tk8f9bvmfqqi1bcpdsd4gg28/vubeboxi.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/dogoluriroxejurujefitif.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda6cad074---mefiwewoxepi.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/fasubagefuxoxolo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/munelobemovo.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/22713493508.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/nipizepogizitarinakiwema.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9efbbf8f---17034844967.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/jowibotaladowug.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4300efe46---puximitifoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=8.ee.1+worksheet+answer+keyPDF 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_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 18880 bytes
SHA-256: 72d26df4c9e83bea115a720843afdf7904edc5643a07bd150082928f6e643b7d
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 10588 bytes
SHA-256: 70ecb6a97947eeebfbf2515253ead7a6b7eb06a2ceabc9dc1bce5a21da44fe6f

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