Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7c4a83aad51e7f…

MALICIOUS

PDF

94.0 KB Created: 2021-08-13 03:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98834030f95aeceefbe9f13efbf8cd20 SHA-1: 40b2327d112a8a961787b82e36407d9000bdf7e9 SHA-256: 4b7c4a83aad51e7f2f7fa4494f58f3617361f5655ab9ed5b7fb5dddeb7fe235d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The PDF's structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://dsverano.com/UserFiles/File/kifitujokuf.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fa8180bac67e8a3c26311c8b4535be0a/43704342573.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/dejogibilozonifazus.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/luwesakanapomorexufuvoxi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/4228537199.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggv9b5ht3ev95c7enjgebr7bfv/jirajilotibiguvuw.pdfIn PDF document text
    • http://nfc.soo.jp/file/46049569965.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808fbc94663---wazobokajenujefinol.pdfIn PDF document text
    • https://esvigo.com/upload/files/75880853995.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/rrlk2ufbc0g03oq5o50j1q8iu6/rofimozetadali.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95e118c098850e881736d3e2649404f8/35642154763.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/tebafimikawaxarabuxa.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/695d741681096b117b6785425961d8ae/tojexupudufopevurugoxep.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9f5a7788---50402349321.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/sazikevekewikiw.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5797f261e9---kezubafagurax.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/81518857758.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/63256203908.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/45705132714.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53209120144.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210721_A450A646FD855801.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d64fe16963e---xoxalisuvojopusaradibe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac73458dd---diguromopunutalozisireli.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/bosizabifizazesenokoki.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8191b28559---21150117235.pdfIn PDF document text
    • https://marigabung.com/contents//files/20102426112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+does+it+take+to+learn+roux+methodPDF 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_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 17268 bytes
SHA-256: 3a26d2dd5e1a340d73fc6cc2356381f9d665d2b1ae68508af7808a7b97d1319c
font_01_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AD 11068 bytes
SHA-256: ee6b4cca4a17bfe10b27d9dbc29d8abe8b9f635acde58de4b785e3a3bcd3a7a1

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