Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5d495f1940444e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 05:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 046a22629a91b52e143ad5c1382a4588 SHA-1: a6d78e742e5256b9bc6bc5eed3019af10867cf6b SHA-256: 2a5d495f1940444ecb41f275e06e46e5bb22fb042aea030d69f1781c11aeab42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=medical+application+android PDF link annotation
    • http://brbud.pl/userfiles/file/gavowapenadegabisi.pdfIn PDF document text
    • http://short-story.ru/upload/file/85763025439.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fomogajere.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/fonujatufixug.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/55132624819.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/wufegiz.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/45429468454.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mufawibunebizumimetazad.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead9a9147c---82601116344.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/94574897064.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/26010858679.pdfIn PDF document text
    • http://lulanjina.net/upload/files/neruxow.pdfIn PDF document text
    • http://poliinc.com/upload/files/silurovugapotixudabukob.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/kafibodijekasawofavorekek.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/58667268444.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161396c1bad35c---mudepuxuxujomituzeg.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/82458594153.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wuzabofunokumololiroju.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613593dc08ecb---meworuxawopotopomawane.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/98137283548.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/30d46f59f531e90b4b2e6297ec1382d1/dipizomumelewutinatoto.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/tofujawegusim.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/fapimunawixeg.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/zogadoxoroxedoxifinila.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da0a91e1aaeedf37deab8600b49f4ccc/zonatarikewusoparuzasimu.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_off0000c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 16348 bytes
SHA-256: 0efca36c145d7872bcb4289929bfdf021f4de2d8f99fe92ac679351a32045179
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 10332 bytes
SHA-256: e73e005e63c1bc4423582f085118db1012798b77b6cd302d590c4901d57109f3

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