Malicious PDF — malware analysis report

Static analysis result for SHA-256 d903c942411a3b31…

MALICIOUS

PDF

99.7 KB Created: 2021-09-23 00:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a0b6c73918bdd050ad5374f5b834d74 SHA-1: 01ba88631c6124b40b90c62c516cd984e308476d SHA-256: d903c942411a3b3122d9142bd8d9de95c9ef93f7d3d0ff8d9dc9424d24eb1b90
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive recovery information. The presence of numerous links to potentially compromised or disposable hosting, as flagged by 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', further supports a phishing or credential harvesting scheme. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious content within the PDF, likely leveraging embedded exploits or malicious links to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://elmawadah.com/userfiles/file/2234930742.pdf In PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/89842137823.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/10804613777.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/tetexuvifitopanuvujob.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109041055418260.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8068ed27---mowuzax.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/41831325789.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614729729e930---86048480627.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wiranoz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/u8ku45ph3c2cs1udjmoj6hgil6/92268087103.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fobotizefegixorabobisupax.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zelaredizipazizir.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/21592186895.pdfIn PDF document text
    • http://tano-cable.com/d/files/74602832407.pdfIn PDF document text
    • http://e-menu.hu/editor_up/zomaxopode.pdfIn PDF document text
    • https://akconta.com/uploads/files/nugififofuxozuwasixip.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/64217203935.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/filifaparonulafub.pdfIn PDF document text
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/7579332980.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/xogebex.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/mogagedivamiv.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/voxozuxerarurajidugel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=please+include+gradle+in+your+pathPDF 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_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 19172 bytes
SHA-256: 6242112710f29e22177f0b17b787b51009571a189885844b96f61e33d68bf987
font_02_sfnt_off00016787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16787 11008 bytes
SHA-256: cf4c10af962a0e3b98a701863efc9ad619b083684ac72d20e153bcecf3114501

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