Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2581b1ee157c147…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 13:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca44facbccddb6a9c7ef4a14518769bf SHA-1: de7dc0f42ad22cddf24013f5cc75a3e1f5cf45e7 SHA-256: d2581b1ee157c147a644ec1c2b1daa33b4f7d62d90c20f17ee448f57ae0142e5
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 CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack vector appears to be directing users to external sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://seamacros.com/upload/file/wemefaruso.pdf In PDF document text
    • http://totoquynhhuong.com/upload/files/babinodu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9ad44769fe475631f75be38be736430d/dimurux.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/83182552248.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ba596521---zedubemir.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/getudokaluxikamefibedaf.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ugqfej2kr9cg4pvtuirljqlquf/puvozaxetosanive.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/bevalimadupu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/par7f7pkvq7nlvam1qv3tb9llo/42054107080.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3annk93u53o2jaipnbu2fgnnb5/piwewad.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/tokeniwatewafelemesapu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/wikotarin.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/3506d11qbfqibtolso1nvgoi66/jinunixipamezamunulab.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/woxalabafikebamusutakot.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t2i6l4vflfseg28o93939iqih5/21340179338.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b434cb4af8006b899ce8ac21cb613235/73505430572.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b21886f3eab---34736278184.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/4203728183.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70880195424.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vakerazivul.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc62533a19---68220547727.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607256f53f77f---96966517366.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0j8b9huotjien304sg0sdmkq76/xexijefevoku.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5chhh0rbvlthr8po6ifh27kodr/jukonakub.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/mewumotuzibewot.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a84ae982b---zixakotoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=odmiana+czasownik%C3%B3w+rosyjski+pdfPDF link annotation
    • 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 11152 bytes
SHA-256: 2158396426405e8f80f1d767c5ea867b3243297a15cb5aee3b6c3b300cbb7376
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 22432 bytes
SHA-256: e2e726b0e9c6fd27350a398a5d0825e2b8f186014de8b1c3a3e845d6de78c8d0

Open this report in the interactive analyzer, or submit your own file for analysis.