Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b36813f9f5bb2a…

MALICIOUS

PDF

78.4 KB Created: 2021-10-07 21:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa4fc5af67b0e0b361d7b543df9eeab2 SHA-1: f03fb624b03cade411b403cdc69432e3e1587132 SHA-256: 02b36813f9f5bb2af35c5bb71e458197ef17c891c3a88ea9e25513c5cc4aee12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://macauroommate.com/ckfinder/userfiles/files/zawajas.pdf In PDF document text
    • http://kccmaul.com/files/files/sawowupepofamuduniguzamig.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/nimuxavuleruwofomajipis.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/21064419125.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/xokasabarabiz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b035a551e3cf35878b2ea68c22876a2f/motijusawugekubaz.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/67e6d48db9eba041db59140d1427ac1f/verevisasikakagaxexil.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/vabeluzidanijenurodaziza.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/jorozexeribivolez.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/21082153939.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/vukuvewevaf.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/pikenokefanawoxe.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/aqbjsgsd1fh9bcjptgjba7jqm2/besotevapet.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071ef519c3---42361907530.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae4a5dd451---21665459304.pdfIn PDF document text
    • https://norservis.info/files/files/xuvedumipogovipoluku.pdfIn PDF document text
    • http://qzgj.cn/upload/file/65229846927.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11226232134.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sezododudinexiwaxozagu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/4614225360.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/25747857414.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/doxuwesoruz.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/10594203544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=stone+mountain+state+park+campground+ncPDF 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 17000 bytes
SHA-256: 7b1ce119048642b7d9a64e91de2a9850224b5820714329193af3498c4c38bacb
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 11080 bytes
SHA-256: 703b47ec4cb26738a5ff70f7fb53db5e65b8bb8838ba400b11347770c94a73e3
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1