Malicious PDF — malware analysis report

Static analysis result for SHA-256 c035bae27cd5d5f5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 003c41f22e0497abc2be339f269be03f SHA-1: 89f24c2db713de80600b6e75f65914ed0e94c2b9 SHA-256: c035bae27cd5d5f5987b0eed384a5a054f50f56adffdfa8c765fe7ddb8d934c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad733901f2e---87288685983.pdf In PDF document text
    • https://t2sc.me/userfiles/13450804951.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160848430ea340---54106693470.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa263b47d---xadanedalikaxi.pdfIn PDF document text
    • http://willbramephotography.com/rinifugolox.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/55132046001.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kakijudo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1112c4eee4---mufakaxijemapiwud.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xozezatomobokipakodemeb.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918d7c6582---xulalipifobazumajedim.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e09bc3468---rudijexon.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/91369021464.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd846c14---vorekikatipi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761972398b4---55414992023.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b12cd151---fadabekixamuxi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59115914563.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/90956683455.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/27865279269.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/rolijipevite.pdfIn PDF document text
    • http://isvpro.com/custom/files/58459720604.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c0bdea8c16a24e6daa5b88d8618f258b/7903005573.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210728020721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pericarditis+in+dialysis+patientsPDF 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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 17504 bytes
SHA-256: 6bcc173c25d6292f47076fbe2bafce15689c2fe3a73fc603367428cbeacb6266
font_02_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 10500 bytes
SHA-256: e2f6879411882c747896c68509e20b539260d78da7e526dfd99e057b4d7db56f

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