Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d703bc31de07b1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 13:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9e28a02c2a21690ac58a5cfd11764da8 SHA-1: 4fd7a8dbb15ef95862b7f843f2dc3267da2be530 SHA-256: a3d703bc31de07b1a0e13d41b439b6d68429e2bbfd48a5b2da3c2890a44a7e3c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a link farm and a lure for browser extension installation, a common social engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lures point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://viprealestatebrokers.com/userfiles/files/82668101792.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/wokevoxesomerefuve.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28bea10a92a8f41255c5b7efc9c93e8d/96894255536.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/93717380716.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/34100328537.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/lezekuzugedoko.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/45095158626.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a025510e4---fakubutelunonuwuratomawu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/l5ecqeqicgpiiqusj5vvniu6q2/xabudogaxixupidowutilaz.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e05c6bf30752d6e021cb959686e99a9c/76912771868.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gogekemol.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/jodupewelulijomarunuxubo.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/mesaja.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090301187198.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/bokonupitug.pdfIn PDF document text
    • https://profesa.net/userFilesfile/88980160516.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030908077659.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/luduvovubuvutamunafisaza.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4926f0fe2ac903d1f7fbdec4f02fad70/48453894528.pdfIn PDF document text
    • https://purefeeling8.com/data/file/vutuwina.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/bakulozipowasa.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/28512229813.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/bifopimuxewevoduvusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+android+apps+apk+files+from+google+play+on+pcPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 20052 bytes
SHA-256: 3436bb54ffa7f0c288e6084d6bf4756b57347cd681291a759efe7afb9f78bdeb
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 11160 bytes
SHA-256: dcde9a3a6df0b93d758409bac0bc80c2fcffdd208419309b680a4ac6ad81147a

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