Malicious PDF — malware analysis report

Static analysis result for SHA-256 071acdf0b3b51c0b…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 07:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3939aa97891d28bab4cbd06e76acba25 SHA-1: 8b89cb27812bbacc816a2bf3edc0da5a0fc51d02 SHA-256: 071acdf0b3b51c0bbefe354ffa0b1ccdb7747aff2ac77e364728dce550e58dc2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to mislead users or for SEO poisoning. The presence of these links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://matharu.ae/userfiles/file/gujuxa.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/61803725725.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/bupibabagurokumemoki.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/80714746421.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e00913681---babexolefuvop.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/7830364503.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/4851426145.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/61849892641.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/gomirijaxexoxo.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jawizid.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/45062645591.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cff256d5a78c3b02906daa8d27f012ce/11841337184.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906061958.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/95649302743.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/82977346571.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/kijugegekob.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/wepozutedum.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdd0728c1---77847140358.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/jopadanaginezenuxamav.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/15122716917.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/vadedupakugot.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/kisuresipaje.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pumusikaboga.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091415365173499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=act+science+data+representation+practice+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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10548 bytes
SHA-256: 5da445238cfc0b7369c4fcc2cf206e723e6fd441a3fbce169a28fa406a493325
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 18356 bytes
SHA-256: 99e3240db7e21c1a133adb907a218a9a45341c3b0b16b338a0aeb93c3989757e

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