Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d1f4f8a7020ff4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 16:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c59714bf1b9b437ec6996cbac12e223f SHA-1: 5b4d42f2a36baf8fb9e4785177bfdf1de24bceb6 SHA-256: 19d1f4f8a7020ff4ce8dbc90b9fed4ddfb047eb8f89fd19512de2a3eeb08a222
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of link farms on disposable or compromised hosting further supports this, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vdnm9e52kkdtovtfk20inndhfb/gizelaxadevakepikotu.pdf In PDF document text
    • http://zrdb-drogbud.pl/Upload/file/40517266889.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e897d720c1aa09e2c58ab22644d573dd/24794022138.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/kewutuvekepibumamubep.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/76710237503.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c05817061---veramidajezix.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xexukegebaji.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/23676700546.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b390f55404dd79a8e428f54d08474770/zugojimafujupile.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/zedulidiwixitago.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e33cc86f6---kobovoxubopixikobizelebo.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/dujemudapipekojituxixa.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f5978c873639058aec0aafe5903346/40190385185.pdfIn PDF document text
    • http://hodori247.com/uploads/files/desupoxafokogobiva.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0916fd58---retebeduvupewebadanozi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea3821ca1b---zunajekad.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916506be0fb---84372992963.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5b0d5829af6507949852d5e8c10aa54a/70235824316.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602700c640---49286366592.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/wukow.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9863eb8136d564aebfed1558b464742f/61777965813.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/67925426083.pdfIn PDF document text
    • http://clingac.es/d/files/20145710435.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2dd9b31da4d8cf77306749c7c8048a27/wupivakarebekimakiti.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe9e3365b3---kilobitawozuxilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=approaches+to+translation+newmark+pdfPDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 11044 bytes
SHA-256: d6b7c2a2db08ab14f4a13c629971aed79f08c6e86b2a1b80c0373c99c315f9d2
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 17104 bytes
SHA-256: eb9a0c424a1c420b00564e68963f1d4664c883f91b4e39e34bb37d47b49e8141

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