Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7d82b0032912a2…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 21:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85f624d96d9c9fd870c8947632c0f142 SHA-1: 615a35bf4a06813c8a526bd7ae3e09b8929084c9 SHA-256: 2f7d82b0032912a29f7f28d01538f6ff7f8b23125ccb3f0898f3c963cc4e278f
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates it attempts to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may host or link to malicious content, potentially leveraging JavaScript for execution. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further support a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://agataklimowska.pl/userfiles/file/43488101882.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/dizedaxi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a9b94ac72adcbcbc7c52f246ff373fcb/fotowijekawikini.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fopugurugunedozagazigum.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/53026806818.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/guzurep.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50430951768.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24751d3d45---74937857703.pdfIn PDF document text
    • http://protok.pro/upload/files/wenetilomeruwamu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/rmm0057prukpfgjqfgctq3ejg1/nirolajulefulobasi.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962a9395a82---20523165987.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae4cd50ea0---99148064196.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/39001540194.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/34fa293bf939cb820546c17e9329e2db/86468126873.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/69953035011.pdfIn PDF document text
    • http://k1a.ru/images/files/file/dapiwajasojedoga.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/pigogu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/291722181824.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210720_3E5DAD75A5035D59.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/peritam.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/m1bnjvgp5lq5s8c8khl3kj3cq7/nagerot.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98334b286---ropozusik.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6c846f1e---43060491308.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/91428128404.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b960f528079309a2f54423c5baf346c8/65517024647.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0081afc9a---pugividafimos.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jitekiduwuxemevinamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=commutative+property+worksheetPDF 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_off0000c499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 16744 bytes
SHA-256: bd46650980b37ef1ba12290547acdd59b3148c551d40a95a1227096164831970
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10856 bytes
SHA-256: 07e58ce382d0eba80e2d9741b5617f4d067f94770ba61261da15c45698c7e35d
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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