Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f5d678f962899a…

MALICIOUS

PDF

57.0 KB Created: 2021-09-30 19:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c97084c85fb19f71e8417bac91b82dcb SHA-1: 91173ad42f4e3f86ae5f7c56aca70760dc44d4b7 SHA-256: 53f5d678f962899a701588d96fc5f9d39631c174da71e83208be06044033ae1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, but the heuristics clearly indicate a phishing or malware distribution attempt via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6612

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pixomot.ru/uplcv?utm_term=sims+free+play+mod+apk+ios PDF link annotation
    • https://edusfera.pl/upload/file/vugidevufosifafugiva.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/65517650545.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/pukikanamid.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/wigigebezadewinebovuz.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nozozererilel.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/migupitenupokeruraxa.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/bipagisizupavokewiv.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614417b5bbb55---48353435229.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/27570566997.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/suvekiwow.pdfIn PDF document text
    • http://princeverma.in/uploads/files/kigiwarelegabu.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/dugowobuzokakas.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/92233512978.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/82406300738.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/tikopujudiko.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/dofasokobofulopefuf.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/11810405213.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/pavelabubifativubusezakis.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/98031510507.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/99689095440.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b119f3adcd7df4e05177c0935ab1718e/16662168865.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/33339710698.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/jedagexodumigutixufuga.pdfIn PDF document text
    • https://afayl.com/userfiles/file/winolosolegokutesigexelaw.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/62c6d868a6ff7555726506f5a5dcc033/43624238065.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/gomixavakosok.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CB 10740 bytes
SHA-256: 6f17a5c066d9f4a355d7758d958032aa80d359908bade7e300bd5ae5ae1ccf7f

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