Malicious PDF — malware analysis report

Static analysis result for SHA-256 4184e2344221dd05…

MALICIOUS

PDF

93.4 KB Created: 2021-07-02 01:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21692e308345690231a29585f0063d6d SHA-1: ade3d32fd9e9eaa4d478c455566309624e0fdf1b SHA-256: 4184e2344221dd054545b86195d7e0c0c838efa52ebe4a90ebeff4c301237286
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=5th+grade+graduation+speeches+by+students PDF link annotation
    • http://tradeweb.es/userfiles/file/35066646342.pdfIn PDF document text
    • http://davcpundri.com/css/file/4649893986.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d961bd3f2af---vorijopuretatulavorokazu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e27b90ef0---xogomewi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l8nkilo9gfla6nlf59v0iesp09/rafodomixixi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/788480759.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/seroruvefuvuwakililoziput.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sarowunekuv.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ec6111510ba34c5313c9db01a14d4949/60738632493.pdfIn PDF document text
    • http://toonesk.com/upload/88754599692.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n2dkm6r825lbpk6j5havf5veo0/81367043041.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/latepewuxok.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23d3fe57---xemuxebopado.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2aus2ggm8d2klt33rjc3qmdt89/18646911996.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210529104336.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad854a39c140362b2a3f58944f80cd7c/mugobemosolejetokot.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/29568900872.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6b48dbc78d2e11a5deacd23ee3fea910/67364338691.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2b4a7ae1---46200412856.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/womin.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844e4b32c7---nurotun.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e623b5e8c---6805314520.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46094b8d7b---logoguxosiwi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/legugisejajagiwaf.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/69163407422.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 18164 bytes
SHA-256: dcccaf74910802703b6415bb7f83b6bb00963d84ed897db0704c16ac8e3bdca7
font_01_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 11136 bytes
SHA-256: 134bb3f3e14759ccf4773dabb220229131d975b27df7af516889edfd4868a0ab
font_02_sfnt_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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