Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c912aa867640ad…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 07:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0e384b3c498cc551221daf2a7683903 SHA-1: c472eda5aab39594bddc83203b2d7ad5bff54b73 SHA-256: 40c912aa867640ad38c4bdf5348682fb76793238854605fdf4a57c62c0c414fb
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing trojan. The presence of a visual download button lure suggests an attempt to trick the user into downloading a payload. Multiple URLs pointing to potentially compromised or disposable hosting are present, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=manje+bistre+movie+online PDF link annotation
    • http://architetturaurbanistica.it/userfiles/files/satawugivoxovadamidatimum.pdfIn PDF document text
    • http://puisan.ru/uploads/file/mapupu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d78445503---ridarowedalatitubazop.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/retamusimiro.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/42932203731.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/lupekamerurese.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/78516060296.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/wapabokerenilowowetixedod.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/bedutikadilunesik.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/49156899307.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/21920073987.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7f424nu1rm1bfucggqhbed413/69306410707.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/95819759795.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0r4s083l1j40nk27n7lkb6d287/tojobizutonidun.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/papopexi.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/58254764353.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fdde2906c---99185841559.pdfIn PDF document text
    • http://coolscape.info/images/files/kekid.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/dizolijodafijajefejux.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/juzifomowi.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_off0000b983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 10600 bytes
SHA-256: c4f0cea739e73ced829cc5d955c06ed2412b95d3b22b84f2f1ae42f6be49e702
font_02_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16900 bytes
SHA-256: 32c75e4bf222dd713bfdd76b4a8dc7ac3e45d356e1443f42cfb4037729a3d67e