Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2007e1354d1567a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 23:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: faaceb28c46d3008498a1dd3de44e5eb SHA-1: 8a24f8f35284408145a5c34d6efb4dfdaefa342e SHA-256: a2007e1354d1567afb84b54fbee6c419a16a80b32f815ec35c241f6f67aee82f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically highlights the use of compromised CMS uploads for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=script+krunker+aimbot PDF link annotation
    • http://preiswerte-unterkunft-papenburg.de/mediapool/88537223444.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/13806108089.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/visivulipitakamo.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/zulezogepikum.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/37915702750.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/mafopuwatoju.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/4187810428.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16147200773809---2748682668.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/vizij.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/83929002017.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/34433284807.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fobunikanugif.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/vapiribigularemuwogujilit.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/masar.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/wusakoregepupofedezur.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/15024470c63f03905c0dd108c6374d96/xafavejoviwid.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/50652488643.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/20225921898.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/xarixomazogo.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/42099328022.pdfIn PDF document text
    • http://flirdining.com/uploads/files/34310907000.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/627814548.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161434e81a669c---90533551522.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pufisi.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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 10728 bytes
SHA-256: fe0edd360496cf369cc5dc545f682df00237c4d0f635aa78f28256ce137a3012
font_02_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 16100 bytes
SHA-256: a91581def5219b8039a13b740714b421ceb9fbf56560808a182e2383a6495a3e

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