Malicious PDF — malware analysis report

Static analysis result for SHA-256 e404f5c51e76acc5…

MALICIOUS

PDF

87.5 KB Created: 2021-08-12 13:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 698cce2dc3b6f64b6c1c1bc5b7c9de27 SHA-1: ecb3bb2761c28be081ebad81a0d7248c1a3365a8 SHA-256: e404f5c51e76acc56d2e781e7d0c30e4ef66800bb1ae83cd8285efcf1408b351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO poisoning or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://soalmatematik.com/userfiles/file/fumakebevuzanitefagudu.pdf In PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f68a4c0f5---35304795447.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xufupopafo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a02b387fc---gozozibazafagatapulu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/94343106313.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a31241573cb---9923173163.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3843a2acace78ce5913be6d10adc5549/rodimejanif.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/68067410515.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a912bc395f0---57925653510.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/wananoxeg.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/25507452662.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/fiwutunixojeru.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/16663085496.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b111d2346---popejogafomexitironu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cfb2e49c---sifosam.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/fufabafofugulerugaze.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/o0ppbvfjcfrvhfkefrmaj12rvf/53265023740.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qek6mllgs4lrsli5jft5u7sqq1/4723578325.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2312d476ef1ea30116c724c75b7ba0d1/63916282787.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/tidukoxowigufidenaviv.pdfIn PDF document text
    • https://digireg.lu/upload/11734738147.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/50967238512.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gpeigafaqsb2lftdbqmcq2i7j1/nexisoxapibotirevelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=an%C3%A1lisis+literario+del+cuento+la+gallina+degolladaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 10804 bytes
SHA-256: 38e39d9817051242c2a12474d197d5125c0fdf999c0cb93a45958c5046fc5857
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 18548 bytes
SHA-256: f666cde898ae1d40eee7d36172b74f51c5f59483b69b60960fbdbd5c0d1d7da1

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