Malicious PDF — malware analysis report

Static analysis result for SHA-256 438c897d3b56e3b0…

MALICIOUS

PDF

159.8 KB Created: 2021-09-04 13:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a43197a82a00734a49bd40c2c57361fd SHA-1: 2da5ade0f4c917a3794446101d50e5062b8d0ed0 SHA-256: 438c897d3b56e3b069a7fea671465fe4bc59840032a5b9824bb74f5a0ec1b6b4
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary goal appears to be directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fda5095259f---73127381931.pdf In PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/ruxatukamunabuwudek.pdfIn PDF document text
    • https://swiz.eu/files/editor/vabokubokosub.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/rapofemofixinigigino.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/jenasezawu.pdfIn PDF document text
    • https://isosklo.cz./uploads/76737463227.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/nawozedotaviwer.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630630685/file/nerojakanedanab.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c7d9fff9---97179167552.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a52adadd---sukajotidisovutav.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/82410149015.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/xikukuwujit.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/366025086.pdfIn PDF document text
    • http://vititanon.com/user_img/files/15545070606.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zoraviraxuto.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/bisizupo.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/pevetuvukasawisolisi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a27338b734a---kiripevikowebutuganuduve.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/wovifolaroj.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/27399654272.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/86212227039.pdfIn PDF document text
    • http://appchecar.com/ckfinder/userfiles/files/naduwotiduj.pdfIn PDF document text
    • https://aashianarealty.com/file/guramaloxenata.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/41044847803.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/9414911662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=insurance+code+of+the+philippines+codal+pdfPDF 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_off00020d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D2B 19452 bytes
SHA-256: 3fdf61cc85b6af3de7886bdd6326b8680aefb5391e161dcbb4d434c1faf8febf
font_01_sfnt_off00024048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24048 10768 bytes
SHA-256: f3ae3fbd890d945a23c84b13c27e641354cade217ca078b635e97037c6c37cd1
font_02_sfnt_off000258f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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