Malicious PDF — malware analysis report

Static analysis result for SHA-256 f723b164238e0eb8…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 12:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcf9f88e8227e2c5675843d6898889f0 SHA-1: 6a26a2d58f8aeeff2cc3119726a7db208160e930 SHA-256: f723b164238e0eb82a3f3a72625cb4e6e5cd77c6ac507c7773d069b5d1be8b8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm structure pointing to multiple distinct hosts, many of which are likely compromised or disposable. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9818

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b171b3caf5773596d97137aed99ca99f/lulajimokikesodipoxuto.pdf In PDF document text
    • http://islandpointfl.com/userimages/dibaloberedodisakav.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bcb2fb4138ae40f8406fee8c1112542a/58488938317.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/87tis9p182v4j00ounaid2lbh0/silezuxisifa.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4786aee245---zajabizuxobusajokanotope.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504103210172.pdfIn PDF document text
    • http://splogservice.ru/content/file/kovovulojo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160947f3a4a89b---rupototeb.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dowanoxilabexarinoduduz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdaa1dc9a---silikalosimugumu.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f5ffce3d6b71c0168cda4c7ded473476/60728782402.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/73426352861.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/49489867860d68351c3836.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/863d9da955967718e3e5416ca014412f/4572377412.pdfIn PDF document text
    • https://medtek.vn/storage/file/nepuwe.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/67076391868.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4903f4cb---4068422344.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9f5616e197eaa3b0cef1a02a50345cd6/32551977063.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/tifitomozizudevusode.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/93272249026.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/k4eip6dmo2f045cu34d4u6n0r3/wifexigopupudalelaso.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609627aae6edd---74974851118.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d321f83918---zebewiparibobuselefisi.pdfIn PDF document text
    • https://vestol.bg/files/file/76379073812.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sumukov.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/pobumojafos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=need+for+speed+hot+pursuit+apk+modPDF 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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 30112 bytes
SHA-256: 51357f33ef0083d5b6b917bdf082f612e5a1dfa9753a3ccfbf49ea29e7e8bfe4
font_01_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 10780 bytes
SHA-256: 52f98ce6663b18eef20ebb6671db2de83f1786a07ea2454276981a705864950e
font_02_sfnt_off00013eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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