Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73608aaba4053b9…

MALICIOUS

PDF

138.2 KB Created: 2021-07-04 11:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 115575c5ab95065dc816d9a698cc0992 SHA-1: ae81282de0b22d05e4726323c8c0cf605408c1d3 SHA-256: f73608aaba4053b900083a096e7de99c0c76d822e7dd6eeaad9866a5120c4a7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm hosted on compromised WordPress upload storage. Multiple heuristics indicate a malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe80a563ee---lunonowasevijizev.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ad2d8660---gigigexififatanir.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kubinejajuxonisokabekik.pdfIn PDF document text
    • https://hirurgija.me//files/netulinasuxusi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ce037602897---27238131491.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc833e140---35602436593.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/foritulajuguvewewuv.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ahtskvjgb2i1mvnu3jum9tjk90/20703198425.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/47226759383.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8a22576f7b3dcf659f66ee03ffa96cde/mujimaroretigekivobaxa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/978943a4d485ec7a33b5e67952c0962c/sukazebewojod.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb50dbcda0---jupot.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/9371638104.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c6c490b0---rufumurus.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/mugitokorusot.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/94217df40ffde6aea4607d541ed491ea/didewuwaletetaw.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7311d8f5ad---80636015918.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248688fe6b---dazali.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde2c4601c---miwuxeregamatepo.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/50319954343.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/54545382354.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb957eec65---disokewafadakemev.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7594a19928---gepapuresogiv.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba1c19b93---kizobozunologeboxigiwo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kavq5no61uj76t1k0lj8ui98m8/88980653339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=analytic+geometry+ellipse+problems+with+solutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C35 16224 bytes
SHA-256: 7dd5fb61ea0ea1e3370d26720032e9d3de5740e898843eef2fe92164eee2597e
font_01_sfnt_off0001b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B214 11240 bytes
SHA-256: 3aa14abe907e9825666d179bc67d4988f29e03f126a7b71ce3b5183a71bd0532
font_02_sfnt_off0001cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC1E 20496 bytes
SHA-256: f82de891e95099a627a24c1bedb6ed333810c074b15166034abec27a58741b29
font_03_sfnt_off00020277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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