Malicious PDF — malware analysis report

Static analysis result for SHA-256 2348421b74f2ed90…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 14:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c45944b0357421be086c340134176e4d SHA-1: bc4387828d1161e68e9fd4f452ba4c0ea57ac61a SHA-256: 2348421b74f2ed90c688c5d480db604672d816d05d3a290e837803efc17871a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The PDF structure and embedded URLs suggest an attempt to exploit user trust by presenting seemingly legitimate links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://latework.cz/soubory/bojujubemurari.pdf In PDF document text
    • http://nicenpos.com/userData/board/file/kupurimofetojinufubepolup.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/bibekidut.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/66875394165.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8bbc57116761f7cc750169712b8d86f7/xedunapub.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/234ppb4p2lkam8duqb5d6s2rq4/jigelurepajitozadi.pdfIn PDF document text
    • http://didopack.com/files/faxevuro.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63655137696.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4f390d9b---tazakij.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62758564413.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/79126225193.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/59527286665.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49b80ea18---venubukafafunuk.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af8029e56---piwosuvemavate.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/xanenovi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ecad011eb348f7977f3d159c98278606/2638893004.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6cad957bcfab0c0c650000722a3c1b35/zimij.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/96276864353.pdfIn PDF document text
    • https://penal-garazh.ru/files/penuminuketufexerolonodo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/603f717e767fe7cbc2a1ea983358317c/nuzujijojigutonivunud.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e26039cbf11a3fbac747c79e585c916e/jelinadevi.pdfIn PDF document text
    • http://canvangdientu.com/images/file/mamuzadezudiriri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cfcs+are+not+used+in+air+conditionerPDF 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_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 10552 bytes
SHA-256: 24d8c8d049fe4c1f4c19d69a7b80a759ff42a3fcb452ac9e7e44071356e19abe
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 17180 bytes
SHA-256: 38a457420ee3884645e76177872853237e2c8e6cbdf8439b97db7f9a58d50e6c
font_02_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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