Malicious PDF — malware analysis report

Static analysis result for SHA-256 716110ccafe82cf5…

MALICIOUS

PDF

95.9 KB Created: 2021-08-12 12:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b53062ab2d6fabafa6e387ce0f97291a SHA-1: bb8d18a7941f4c2c7e111f15d2ddee98c80b3a41 SHA-256: 716110ccafe82cf5974c3267ce7a3dd4a23e55948b9a18295e857c5bf8a52d24
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb68caf42---15261727951.pdf In PDF document text
    • http://jorkurojus.com/userfiles/file/tojulizuxuguwudedamufota.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/94296518485.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/72949561890.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/xapupigutoluxal.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/xoxuj.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b9868dd5715---13369405559.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/punov.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/woxebilem.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbea1bba4---zojumen.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/almsi7qrdtrgnkhh9t2s0e1kb0/jikezavutomewaw.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4rtsmd8ce88aljndbv301ck6b6/tufoxexex.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lawusegepejujupopudodo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d4187ce50---16154411360.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825b431353c---92892706490.pdfIn PDF document text
    • https://medtek.vn/storage/file/20687563644.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/mimuzu.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/sadakokuzimonasupef.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/90174208050.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/muvekulikilulow.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba9def889---worozavefedejuz.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/wesonarip.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6c503e40e---sopakumewatatibi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9677f1960---sevexekajaluzoba.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/69156614488.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fekozodokunadedudegefof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+complete+postal+money+orderPDF 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_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 17648 bytes
SHA-256: 52fa6840a89010ae3c8be0aafed5b15fc180aec907b97478cc1140a187f26d73
font_01_sfnt_off00013eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C7 10772 bytes
SHA-256: 4f1cecc6ddfb448fbb23a6e08f60e2d5cc806f34bd31dcd845aabf0e78ae5924

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