Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d558f8c116c31c…

MALICIOUS

PDF

154.5 KB Created: 2021-06-29 14:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9967399a54e962c4a3c238c9e72b95ff SHA-1: 6695e35450993a92563ca454ce0b0d0649a08171 SHA-256: 11d558f8c116c31c21bbe7fb3a37bf66899f441b9c880aa5a4176315b23f057c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 https://smidgel.ru/uplcv?utm_term=gender+egalitarianism+meaning PDF link annotation
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/up0529gf46c0g55hsfmfqb3ccg/xavik.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/penufosuzafesurimopom.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7cd3391126ea53939b48ad2b1e54d3d6/31574485675.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/000ddc7afd838e6b7cca0c13249a14dd/16180191421.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9dfb6adb---tugesowutapetidez.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/423340c5bb9307f45d75e8f801ba27b0/85370254515.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc75d3c13c---wemuxonelixajobun.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/89750913759.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18a16227c---68939732935.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9ad32aa8bf9c86a228ceeea056dff4c6/zogenunerorujudedefa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be40342e55d---88988187379.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210623_232436.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/setimotusoraguwamuno.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d156503bdb---rozezulefipogafip.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d36d12d5c903640dd092e21cf41a5e7a/32942692964.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/47715039710.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qqqegenfhmglurblba2hfucm01/41020710500.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bddfa51a23b---93656968305.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/bebunonafupinesijuf.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/jaxora.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/1b9ff53113f5ed234bfa904a692dd0b2.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6hv1r4ftv5l07itbqvoirkkc0r/91390383962.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/74738942291.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB92 10512 bytes
SHA-256: 46969982ea55c358cfd49945fe7af536f6708a809bdbb26c6428a84ba1d807e2
font_01_sfnt_off0002133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2133E 19836 bytes
SHA-256: f08b1865d09c015e513989a8578e60d00c3ad3de2914ee4b833678d13abdc7aa
font_02_sfnt_off00024460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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