Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a60d58f48e17af…

MALICIOUS

PDF

70.3 KB Created: 2021-10-05 09:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5342207be6c9d1e95bcaf2c98ab1139 SHA-1: 42e3ffa84f411adb3d9a573a51a96857683a3946 SHA-256: f3a60d58f48e17afa5e98484d7b0570fc287392bc30a87d0e005bed6bf6a4ef8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'Remote-support tool lure' heuristic indicate an attempt to trick the user into downloading and executing further malicious content, likely by masquerading as a legitimate support request. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=gold+color+html PDF link annotation
    • http://ping-property.com/user_img/files/desaduvezefu.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/4835783214.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mexipe.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/47935881300.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/difeburesino.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/rufejeganogikaj.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/44747954060.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/en0ve6s8a5bnrdj3mlgjfp7baf/bolesodaw.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/xerapebara.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/bupofawopilaforo.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/7784309857.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/acpo7008hui1slfcse2e7fec16/23792526171.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/74809324349.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/44545853267.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/25925381125.pdfIn PDF document text
    • http://zerosquareonline.com/file/nezononusisukojizakizega.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vabejomorezu.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/88353304730.pdfIn PDF document text
    • http://hbaoge.com/upload/files/vekaduvijagigetes.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109200325514406.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a79d9df99e---21869649519.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/totesigaxunuvafawob.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e837ba2add---ranugat.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/23567273560.pdfIn PDF document text
    • 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_off0000b807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB807 10016 bytes
SHA-256: cc975de5669248a532d1b5d24ae6e82fc0916feedce969c32ba42a08f0cf2a11
font_01_sfnt_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 14856 bytes
SHA-256: bad0e27d16af9252a2b1f88ecff818ef86848a155e20b64ffd190d487cd95a01

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