Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8991e0bc877201…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 11:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27459d574b51581281a832cbb93712a4 SHA-1: a09d8ab02894bbc2ea9c2d8838054bd4c80d2091 SHA-256: ce8991e0bc8772014246ce0b91374e8408964e6d01d2e5eed43eecf226691c0c
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 CMS upload directories or disposable hosting domains, indicative of a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://polipadel.com/userfiles/file/9245467845.pdf In PDF document text
    • http://magnumprint.ru/upload/files/25621432982.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210628041026596.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4a9424c---29934679366.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9fdec8c4d---32601001315.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bakuxukofukipazut.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a571e0a56d3---36150611055.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc4ca7d5---lididigag.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b646b6f9---89895707424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa474134aa---59064377913.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210623_BAD7CCCB4684F077.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cp1rqir3qnk3j0rq1s50dqrhs6/59058704339.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/77480a7f5c1367c34e6d4c446f372304/fijavuxofulijojases.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/luwifoxesovuwuxojeb.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6277906c4---83195487941.pdfIn PDF document text
    • http://apismorava.eu/docs/41909158958.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/12867856883.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8ad3bc9c---96200113687.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wekasan.pdfIn PDF document text
    • https://eslms.com/userfiles/file/92611036541.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/4661394097.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/20369020166.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/66039425114.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/dojexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ajcc+cancer+staging+manual+latest+editionPDF 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_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10924 bytes
SHA-256: 01d6a20155ba1af0e1363f00c7c2c512e50e1e2b7680e6d69d1a15ef5ac025c7
font_01_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 18140 bytes
SHA-256: 72b5098c22a932039f2e33491f08759eade037f739153c55f3a76bd52ec4e37b
font_02_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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