Malicious PDF — malware analysis report

Static analysis result for SHA-256 90413a74eed2d1d8…

MALICIOUS

PDF

97.7 KB Created: 2021-07-18 12:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 062aaa55879c1cf7fcf97ec6831143f4 SHA-1: 3883388f29bd5315e951a736d28beb35e244bdd8 SHA-256: 90413a74eed2d1d8de9f991a16b5015f39c67374768527802928045f804ac1ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/96c1c998553890065cb96f164918a30c/91786831002.pdf In PDF document text
    • https://goodline.by/userfiles/file/dosiv.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f58d9e03928308ff1c4a7f2955910dba/rirosiginagogimefegeju.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/nadita.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7472d19e---72638265307.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160af80f895834---66807408524.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a3a757fc280e5bb24e226ebad60e857f/35262495592.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/62188894954.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0f8a9d5ed6215e3d69c9d83d99a3d58e/96754320431.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/kurinu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29802631c---46733566102.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728876531c6---83866210771.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/nujuwesin.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/41200820782.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247a0e2422---ponegisolagurirojonov.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2j9hl68q2s2a0li22ee4ldojj0/18738083265.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609427bce8845---28370897328.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2802961c3c---munalaxiguvumeboxotud.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412ec23e0a---nexavipalipubelazusab.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2676089ea4---magox.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56aec2f5a---53936314613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=amd+driver+update+for+smbusPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 20856 bytes
SHA-256: d2dbd8a36bdd59315f11998229ec5bd4243f727bed303cbba3ba1ce9c4eff5e3
font_01_sfnt_off00012528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12528 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000154dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DC 10796 bytes
SHA-256: 0665b894f3002c8a36b4d072c2c8987f7c5a95b45ac89b5a8aaa4087552e5a8d
font_04_sfnt_off00016d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8F 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26