Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2d58d874f2b74b…

MALICIOUS

PDF

80.3 KB Created: 2021-08-11 11:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f753c912bd5553f212e570431ea4fc1d SHA-1: c7b82961b3f7a495a66e550eedba78f9b9ab3c77 SHA-256: 0a2d58d874f2b74b52059b5357e8753aa0a5ef7a4f60b34560b5867da0668571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c738bbd6547a25dbf906bb5683d90e10/lunutepopuko.pdf In PDF document text
    • https://weilaimachinery.com/userfiles/files/sigimaviwatakaxozapega.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/99361075154.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/00a522b37bad32c83d6f3adfe9a0702b/92033976305.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/94398885748.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fc60a5f99aae6fb8dc1f432ecf2796f4/pitud.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a266ab35df1---wetefunugutamedopexapita.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2e6e908b---37938209819.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/resales.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607355d8dddda---15266646102.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/88244143929.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/77435916120.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/zifojivune.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/jovoxokenad.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcca19ee53b---59352414269.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/galupemeno.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/84275288156.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd8a16ae4---tapavurobosoro.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/90679857387.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/89043684951.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16281529379575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ashrae+hvac+handbook+free+downloadPDF 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_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 19996 bytes
SHA-256: 0b79a335426065d6d12d4b76516d3f6f118138b7da7371a3d503fb22da1a6b57
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10748 bytes
SHA-256: f829331461359ba589222994d76e0bd05c1a15ace03ad306e5b259322e787576
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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