Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6101ce6e72e1b84…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 19:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebab505cb8836d3988cec02ba35ec6b4 SHA-1: a373ade4bf0ae530ef68900b242d7cf197d9d416 SHA-256: e6101ce6e72e1b8446eee5e649869ac9d046f798becd4e05869096daf8bb172e
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 websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dinskayarealty.ru/media/file/53182112860.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc1fb0e45---xujonapobopomewufipabene.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/wapedoziponiweki.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/makebofazup.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/valaxovelidebefaduj.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lagizasilajoto.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/88210260090.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/1101407968.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/musesilukavizodokukopetu.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/89079208195.pdfIn PDF document text
    • http://melvin.cz/data/fenijaxegabujekulanefo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c3bfc14ec0a231be7be314e3c6bcd094/1842896045.pdfIn PDF document text
    • https://seger.cz/userfiles/file/zezavasozej.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/jusiwesilipifuror.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4f34813bd2f6340336d4380b14b1af53/mupubawepakadatizopujodu.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/dowifenunakusene.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161381b7582c04---puzutedorotamuzogegizizi.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/71007176066.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/fibidiguxinedodafaxikaz.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/65151911006.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/67906332263.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/wirumizujakipimejivanina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=toca+kitchen+sushi+free+download+iosPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/dexobag.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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17876 bytes
SHA-256: ab3c6ce477c941916de0587b7b714b84330b24ea0bf374fa219cc578e40eea2b
font_01_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 10812 bytes
SHA-256: 50e1b36fb0f48379b9aeb50a639eca3090aecf4476808c82f8450bc445dbda31