Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a184a16200c464e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 04:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edc7ff4c5ee8d954044ebafc54328ce0 SHA-1: 9a9994014a79c933edd94587c1c7f08eabe86fbb SHA-256: 2a184a16200c464ee22d28b0c3347342a1bc0fc873ed0089686d58a9670475dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust by masquerading as a job circular.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8fe9ce3a---xidavazisopetevogakudu.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210508195907777908720.pdfIn PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608650521b14e---63148966701.pdfIn PDF document text
    • http://someteme.com/archivos/_20210901095312.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/edh5pg4i2avg7vr0d6vuq4ue31/98554484700.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63103492107.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a0ea9338---mavit.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/59364007677.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d296aae5d---99562299703.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab711d03529---nebuvokapiwazu.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/55923607247.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/76975034825.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c83832253---37806701388.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7d403523f92dcec7c90175935d7d6eee/tipavugujaberikedalubopuk.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/13195207230.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7c12bdeb---dugimewejixinu.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/fewelozuzelenomuse.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ioen7m6d5p9cd46q44ol2ib3km/saduroxaka.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///17301123498.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/48799789562.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/lubinomamudojozafamez.pdfIn PDF document text
    • https://somogyplusz.hu/files/68924388171.pdfIn PDF document text
    • http://vecsecity.info/editor_up/lotizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rajuk+job+circular+2019+pdf+downloadPDF 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_off0000b472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 11272 bytes
SHA-256: 4918176cd0eb5d8e16b6f762681d17609bd43672462be5a6e52a5c82e930ba49
font_01_sfnt_off0000cee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE0 18192 bytes
SHA-256: 115ec1429cc09c864972ca061ccc1b43cd21c7c0af99022659c00bd34c4f74f3
font_02_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1