Malicious PDF — malware analysis report

Static analysis result for SHA-256 2989dc22d6d9c9ac…

MALICIOUS

PDF

79.2 KB Created: 2021-08-25 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eec8c2ea940ba4e252a4790439bb94a2 SHA-1: e5babccb7e4bf874591b295e815a4be4939c1178 SHA-256: 2989dc22d6d9c9ac01cfcc1b098945f6dae7b0d1ed4a5a6cb689105da21c1921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o6dk3q5si6uf2b1i8u9jicc1e7/sopobetomekakamu.pdf In PDF document text
    • http://sola-brothers.com/userfiles/file/petijemuridixa.pdfIn PDF document text
    • https://ovalpolycoats.com/media/bojapor.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/lagodomomesuno.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d962d182ed80db85a88ddefcfe2ff895/zefow.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9cf216f76---20972670894.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/74580181915.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/99387338371.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b281922b560---zufitodalafamomufexapozop.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fdd89b4c---deviku.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5h8vp6vog0bbpf1gdj8h9oubtd/72860700438.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/27h0k57g8g6qc5m8rnq213ijsb/nazale.pdfIn PDF document text
    • http://deforma.it/userfiles/files/wiwerupubulexepososaxaxi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2e2b055c33e4007ba826c10acc9bbd2e/53801290674.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/afe1a222b1eac76aba67c67700a3f9c8/27754423073.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/73963399478.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/37241748172.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/81415949153.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/37809686921.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e7251121f---zurujaralefupemadefekemu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210801050500.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/tozupap.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/jomobaxexakibi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbcb9125fd---gojupokanegavusodiv.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108161150243448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cents+to+gbpPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4F 10196 bytes
SHA-256: dbd1d8694159e9fdd1669aea9c0271bb5ab2f81a5abd96fde563ae388cc6268e
font_01_sfnt_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16152 bytes
SHA-256: a296b1387adcec6f3b2576628ea92b3d2a56d809f0e877613436961f86b2f7ca
font_03_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 16456 bytes
SHA-256: 602dc08617809091531b91ba5d3af65c7c7a9da6e06c22c88a499bbeaa7143c9

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