Malicious PDF — malware analysis report

Static analysis result for SHA-256 d664bc8f034a3c67…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 07:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94c68616547b2c0a3701c4de7dbe3847 SHA-1: 547f8e4df78c4a7f8590c0737fd769ccee16f6ee SHA-256: d664bc8f034a3c67ff00a3112ea2657adcd5c487f8cd96b5d308ae61c2adc721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://philabc.ru/uplcv?utm_term=audrina+and+ryan PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2be66642---14804822905.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078db8f40b37---59987891800.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/27351688262.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/267a0cd85e8f54dc0970c84f65094629/natoxamatavofufalagewidul.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08cb80d99---luzusetediwenasija.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/xirukovemolus.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875ef03fd87---musopovolaz.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bomavepojerizalosafegu.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/26653147338.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e912cf27c7d---zesezejumebuse.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/bunelifavugamisor.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3e010bbe2---94845214747.pdfIn PDF document text
    • http://elskenecologie.nl/files/rodezaku.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ae5332e3---bejudafakezorigaku.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/83712054560.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/94863244016.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/murupowaxesexif.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5ac5598e---jakewafute.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/luwuzebigiwadez.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/41619395763.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/visawifuxiwagugiwape.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89619f381---67358181161.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b89817b8a---60954116106.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/10123930532.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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 9872 bytes
SHA-256: db3bd3f9d121222e81857316fc742849935815157601f6be677ea65d34fb5933
font_02_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 17624 bytes
SHA-256: 206e909b4ab601742a4a76493d69b5687edef6f211c59a2cf3a0b289741b84bc

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