Malicious PDF — malware analysis report

Static analysis result for SHA-256 2812dd8a7151194f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 11:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58cfb96d379f0db262b172db59797096 SHA-1: 4b34137c9c695f9127e4f877270374cd20841757 SHA-256: 2812dd8a7151194f77fb52203b571f181ad6997717b71800d72d496b8a2865e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://guanzhuli.com/userfiles/file/siguvovigexufurutuxululeb.pdf In PDF document text
    • https://hgindustrial.eu/userfiles/files/lesexikajejejaxosono.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/rofanek.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613872c06e227---dulaxuzomaros.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/9922128318.pdfIn PDF document text
    • http://mobiliteit.nu/files/91088404905.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/14322443689.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/31592614089.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613312093edbc---derototaxinut.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/23387101327.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kalugozaja.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/87891278666.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zurorowesebamakezog.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jamoloxejewuwopafulolodid.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4bb789521a372bb827a68e4536ff61f0/gejugofesisuzetugadud.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/zipadewega.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109062032016179.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/gizul.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/puwenavarovuxasuxexem.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/35868485752.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/88185102209.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/befiteraxidikosenudi.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/gijugovavewu.pdfIn macro / runtime command snippet
    • http://allineers.netlovestories.com/upload/files/62637291952.pdfIn PDF document text
    • http://www.anaja-interIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mugen+train+eng+subPDF 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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 10348 bytes
SHA-256: 7cb8a374d584f2be8461e3d90b21b882c15d93ad351df2b28dee846670ee38e7
font_01_sfnt_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 17056 bytes
SHA-256: a00d625d7ea0cd6b3c4d106e2896b76262ae5cb64f0195491b2a57ae5f4affa7

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