Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b0e5044ea0848f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f93372af1943d7db095cb399d04d9157 SHA-1: 5b44e6ff267d7d1cabff4abf5afebb6075e94fb5 SHA-256: 95b0e5044ea0848f9559c28445c86280a9ea0a0ce221ad5caadfaa9919fd4870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://allytemp.ru/uplcv?utm_term=how+can+you+tell+if+your+iphone+is+compromised
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51399619679.pdf
    • http://ndt-tl.ru/upload/file/soseliw.pdf
    • http://www.focitabor.hu/userfiles/file/78440621370.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g3v0rems7a3d56p8rpl6j89cs2/45437745033.pdf
    • http://www.sport-konyv.hu/userfiles/file/67730775581.pdf
    • http://e-restauracion.com/app/webroot/files/uploads/files/jebujivadonapupasugigo.pdf
    • http://niezapominajkowo.eu/userfiles/file/27308467193.pdf
    • http://www.tecnobor.es/ckfinder/userfiles/files/dixotamowenugita.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6c48d32b---benuwis.pdf
    • http://shepardinteriordesign.com/rw/upload/file/sazedu.pdf
    • http://intersonik.eu/upload/files/5458073184.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/sasesowiwexadisox.pdf
    • http://vpsystem.com/files/fck/kuweje.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4039758c0---pekofawovoselisaxa.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/rubuvebegiwakirakivaluwes.pdf
    • http://kleinschaden-expert.com/userfiles/file/rejapam.pdf
    • http://www.pratikchoudhury.com/fckimages/file/50662417636.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/87336344283.pdf
    • https://nedimgame.com/calisma2/files/uploads/68452113433.pdf
    • http://alfavit.tv/userfiles/file/47944691945.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/30496815619.pdf
    • https://tanthueviet.vn/img_data/files/4591528952.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/74426028333.pdf
    • http://diagnosticaedilizia.com/userfiles/files/sedazajififaxumubis.pdf
    • http://ryyw.com/upload/files/2021/09/202109131151562593.pdf
    • https://maintogelonline.info/contents/files/puposerixufagekulesozebuv.pdf
    • http://novichiha.ru/pic/file/bevowejujagazejil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb4d.bin
6304c779075897e843a5873e5e2b9180e9d8b0d99db37a25a18b15d99da430f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4D 11176 bytes
font_01_sfnt_off0000d545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 16792 bytes
font_02_sfnt_off0000ed57.bin
434c88b503c51e015a1283d3f8944aee270620896ded5107b3d257986a03c821
pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 17248 bytes