Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb798e2927f6f1f7…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 07:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aacada148761ed27f504f8229d4d856b SHA-1: 60d31fc569ed50488754121654b1de24bb8aebb9 SHA-256: bb798e2927f6f1f74c6c41c61fc0f876589672107abd40b73f0f95bf5e52ba8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wastran.ru/uplcv?utm_term=combining+compound+sentences+worksheet+part+2+answer+key PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160838ea8294dc---wiredeva.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/femejivimed.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160739728cb04c---bawutumuloku.pdfIn PDF document text
    • http://manu-transport.com/documents/file/jevasawusefo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608336e3930dc---16471761613.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/96224574435.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/57706670834.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e05ede868---xedawef.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbed8cc2d2---62059816572.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/25659358065.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dataruzabikoguresibe.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/vanomugusuvinepubowuga.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/vakonuvosurilegaterozevi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d1842294---80812458179.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/94449344063.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/213dcb222d8d954ab880a13f65164ba0/moluwunufe.pdfIn PDF document text
    • http://rentaruedas.com/files/others/lomupovekitanivus.pdfIn PDF document text
    • https://hirurgija.me//files/25999256416.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/kokekipi.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/gunakojazugowiz.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/67475004966.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c5294e797---mudowijovanifafibojaje.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/21252672992.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e37a8b86f2---58413905027.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/lotolepi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607de83d8d1fb---12913482445.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_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 11596 bytes
SHA-256: 9e91318ac6ff909d1bce6e2d04d81fd78d561cbcade802f52ecf7b3ab8bd79fc
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 18260 bytes
SHA-256: 026012c3ff751baccc322ee962613a9dd69d589a416844be6685508765f6331a
font_02_sfnt_off00014868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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