Malicious PDF — malware analysis report

Static analysis result for SHA-256 711328b1953f8c24…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 11:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5f77e76696b6c593e44ee88883e813e SHA-1: a4ed9e78d682671820bded8f95bf36d47029b4f5 SHA-256: 711328b1953f8c24447932003c0c2371c7fee1c37c084aab0c686c8fc4220196
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0912953948bf2730f5a33687a4b28bf3/samatakido.pdf In PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/tonimawerobodegefe.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6276ecfb---7564261328.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607533da0a0f6---juxavikizimodipasilux.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210611_063221.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160881b4c243f4---belibevaganibe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a542dd5b3---47117645839.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/9839179846.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/766804e955c032522e50ee8e4edac1a8/gabufidiza.pdfIn PDF document text
    • http://simonide.org/userfiles/file/14535517166.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57470d300---lifefasabu.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/50378586716.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/daxuf.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/29796827483.pdfIn PDF document text
    • http://mamam.by/upload/File/file/wunalalotorivulagofejapor.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b4006f272---firivepisamofuwufekesapa.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/18080202176.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/794bbdc30daf4af6a6df17af22c45efd/muzusumufagexegegusuk.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184b26b2f8---72405954639.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/dulezugi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/53350455401.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd81bcd4aa1---tavadusovovuwikujijazilaj.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210702_30F3860595BB8544.pdfIn PDF document text
    • https://{YOUR_DOMAIN}:5601In PDF document text
    • https://{YOUR_DOMAIN}:5601/app/kibana#/dev_tools/consoleIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+add+documents+in+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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10812 bytes
SHA-256: 543f2e010b366496f1f7c248439ec4a626cb7c51506485e5f6f4dceab73c2451
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 18184 bytes
SHA-256: 339486f68469d584d1a9c25f91c30a0714161de85d144e22bd567bd0e26fc41e