Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1608cda60ff787…

MALICIOUS

PDF

103.7 KB Created: 2021-07-30 03:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c31a4a91a7db66f8f9bc97d294f2fc60 SHA-1: ad9d9180464c2d635ed5352da0214200a6f41366 SHA-256: dd1608cda60ff7876744d7036e7fef40bd44ff4e290755d6ae2a909038bbdc28
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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 https://cr2tek.com/userfiles/Proj_Name//files/95346191103.pdf In PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d01d9309---74593817504.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/46814716023.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/75766067714.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b741521a3ab---18894151600.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/86910fd136916d17ca1f9a829ac3a927/29128419883.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jenuzofigevo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bb72496a35a6a6cbe83a1e05e0e75d15/dileguxanamuwebufewim.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jazep.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/lawamokufefomegofewedug.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tawuwezul.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kezuxibapodidofolawowuto.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/13087944ea6b7c0818ba8bc75e62b122/samigizalopopavelik.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e24d2625e9f54c7cdeb0450ac47a8459/47152604731.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e78492c3a---muvenugirevifepixebiguk.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d9e32b29afa1640a4a9d70a236266e1c/33586441477.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5af099f9f---witobakubowajuxijoguzo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f164388e---77210441915.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/domoku.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16097a38800976---26100246222.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5b07b729---bopiwibixexej.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/300d6838697c356c4a3674135638b9fe/zabiragugav.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4782a69e0---22310447284.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/8372965922.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • https://steammining.com/userfiles/file/83326271403.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c404428123b---zaxerezerofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=screen+stream+mirroring+pro+apk+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 11216 bytes
SHA-256: 66e22b03ae59983e25cf954599a8cd26d32f15d43b1c3ae2ef5b9618e8aa838f
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 6988 bytes
SHA-256: 530712f6abdcf1c7c9f44c5067f00a860f623d5de9d68ea53a65fdf6661cd37d
font_04_sfnt_off00015669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15669 21992 bytes
SHA-256: 903b7169c80295d9daef5ab511255942615c55d3b9e6a4112fd716911cf02bc6

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