Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f594a8e7ede2429…

MALICIOUS

PDF

84.3 KB Created: 2021-08-25 21:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec25c6096719b64e2c05ddc91979e773 SHA-1: c096b3bf552656b7b041e885e1205873db768983 SHA-256: 6f594a8e7ede24298a5fe499b3cb1a989d7559a8b427cc27c5e55020b8673eda
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the hypothesis of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://thebrownbag.vn/upload/files/niroxikimurula.pdf In PDF document text
    • http://yilip.net/userData/board/file/japozobobawetu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vejidipulozirapa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7aff32a5c5939ada94986848ac6ec726/funigurilibo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/19ef8423a2b667c7ee279ab0ddf1e778/gotisonifelesirezagedib.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/87881768983.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/pikofubofozu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2526725c4b0d1dedfe75aba7d8c0fd6b/razuvuriloserabazezijova.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c2a442c97---jejopeliwu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cef8e6586753bd8a3850d63d01f67673/pexixo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9496980b0f5813ac097f94afccc217db/lojirowenonomej.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f22e92104---dadinivurafusuxusewoge.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/6563794872.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b382bdcf---sipolufa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01fcb557c---gafukabugapogas.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/funofogixekatunu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2849aabdaf---gamevoxejobo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/8273361812.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44711723090.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08bcc392a---dugofaxugovukubev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f13f12e3---37276392621.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/etch57edbf3hlcd093vdh9rs30/83993620890.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e20179ae160---davuxegasasikugotunexem.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/fbh67jpet0uh6ve5rp37dpvmvo/dizerovotesemabotewufito.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bda4b2bd---noguxa.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/joviguw.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/karinezobibogem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+robux+gift+card+codes+2020+unusedPDF 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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 11168 bytes
SHA-256: 7ad9258d5420c1aaba916d8000e144dd8df14e7fd3aafa70522e41e3e6b70493
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 16720 bytes
SHA-256: ca3646cf41b830f01d7856be76d478c584f5ce05132896cb46c628ab22bf52c9

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