Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e43abc865cf6bb9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-11 01:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae500f3db101c978db8f069831f127e8 SHA-1: 96b83675b83e16544a48e5f10a9bf9babc1225b8 SHA-256: 4e43abc865cf6bb972d0233f919325a08a64e47c8bad0f5c08328734276ed0f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=online+convert+pdf+to+excel+free+download PDF link annotation
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/xodoteg.pdfIn PDF document text
    • http://net-marketing.hu/images/files/78069976777.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161326e71284ae---72357018304.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/givepa.pdfIn PDF document text
    • http://apcmagon.com/userfiles/74928665315.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/34786423675.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/37776710113.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/jixeregidada.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/99457253516.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/wabekebenab.pdfIn PDF document text
    • http://ilkemymm.com/image/files/nukobojunumapetaxi.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/24633051586.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/wimizisipifepununotuz.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f28066f231---digujudemavodesolisa.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xonifam.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/lamasotilet.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/mogefekinamuwasafo.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/nigawewixiw.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2a9fa032b439a46461fe26bd0ad37cee/57772184004.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/zidedubijiwibuge.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/naliwabela.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/55829235788.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/4701742050.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/jonuk.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/suwavoxifejikofij.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/91567081948.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 17800 bytes
SHA-256: 66117c57bfc95486339bd6a56dd3f6b3748ce9c905d6969ba677a902b4cfc773
font_02_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 10724 bytes
SHA-256: 527052ecc57848136ef82918908261606eba537f187f42b30f767fe1b86c88c8