Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c20d8db48e8aa2c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 06:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8253d4f0804d6cc5757e6213100f4bba SHA-1: 3f6ed6ac7d4bc3424cd192a712eaedc14bb55541 SHA-256: 3c20d8db48e8aa2cf69bfc6e9ccc1b1f434a7ee50c24146cc34f9fcff72990ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=teoria+da+contabilidade+sergio+iudicibus+livro+pdf PDF link annotation
    • http://esipro.be/userfiles/file/morigupaku.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aacd287fee2---9906172875.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/80603038153.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d686112b8e8bd96d27a9029f726a331b/62316731120.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f46207bd---72231197034.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2a758b0ac602357357b4d37823c0829a/98329268014.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/74f4938498b2ca9fa51e70601a8eef30/56980876300.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/lanexamajusid.pdfIn PDF document text
    • http://edgecs.net/documents/purem.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01cf8e142f---29798491734.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/832e433df3ac744b81b1755aabdc0a4a/fokevopugunu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1b46751989b194392800f545298c4651/wujakinununusugojexaguxev.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rqi6dq6uv8obqdfnkd84jbo2k3/buvawavi.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/18656631244.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/12618553336.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/4688068107.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/85ce92ae8b34fc602418b3d5c1eb44cd/vusezogogepuwaxifoxo.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/10495571034.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/ledomu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///47063130424.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/wefivijeretajali.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e8e6ff1e---24148771296.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zukuvolavefufinefagigi.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_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 11064 bytes
SHA-256: e4a8e073ba3cfdbbd97ccee83f92dcd6c1ca45dd115b0084bd389056bf17fe41
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 20032 bytes
SHA-256: ef67951f040f587c52d13b970a761357b1fcae3b5d751a8cf1094874f8d10d31

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