Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd84a84ff792c51…

MALICIOUS

PDF

85.3 KB Created: 2021-08-14 20:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06741d33659c8bc335e08106839750ee SHA-1: 46b0b524bf0b09a01ab2e067d9ca6e4fd32128c6 SHA-256: fcd84a84ff792c511bf72e07236aa699e5c5e4be95b077d1cb5f3d9489c099fe
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, suggesting it is part of a phishing or malware distribution campaign. The presence of a visual download button further supports the lure of downloading malicious content. No scripts were extracted, but the overall structure and linked URLs indicate a phishing attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2a86eb23a92c8789cba8c367ee339275/11000896703.pdf In PDF document text
    • http://kleiberit.ru/files/file/88113106817.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc072c1bc---76626556536.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cc21ec2b---raxowulugobovagut.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/55042385852.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/mubujoxoxuvu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d183b4900d5---sarepefod.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3ualo5onarue071e2ped8mgvd6/99899578658.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/livoxobuxu.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/16316064965.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pipokiparemesa.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/74266364988.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098af26cc704---3444180847.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66eba18c---38260099640.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9ri2d0qsph3pr4qo5p9kn6uldv/82886486194.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e0eea37c---39829922386.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/tomoxodis.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9dd4c8dc2---peziwa.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/92ef9e075aad0f177b238e920df85dab/semabikoriwarebitiwobik.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/38871511474.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/sewexugoza.pdfIn PDF document text
    • https://mauspro.net/upload/files/49654956140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=administracion+un+enfoque+basado+en+competencias+pdf+descargar+gratisPDF 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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 11284 bytes
SHA-256: c6ae08d8beafda8b7a10f54e7843aaa9b0e05967942f2d31f4016b0d29563760
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 18696 bytes
SHA-256: 506e4f7b4bb6190cbd8e5b92f6c2963ccc6fae4f7cb040e928f58e95efb3eebc

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