Malicious PDF — malware analysis report

Static analysis result for SHA-256 790c03d8cafdd795…

MALICIOUS

PDF

74.1 KB Created: 2021-08-30 12:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b33653de9fa674e726147317fa275804 SHA-1: 36080920ddedf66579deba1c68949101fdddb871 SHA-256: 790c03d8cafdd795776d0ee21f6daf5312e3e1d4f68aed47bb50f913815d5c29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/59543560114.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jgbn30i12pdjvt6tg5j1ig4os5/52313464768.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/pifipajuxaj.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f3995bdf---62468472572.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16089699cf3fbf---1936162088.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/wosoma.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/1c6bifpbq37h324l844qr2dlpk/posuxobivodu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a535914f---lubinejo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/rizodiku.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/seriruwenosonigivuki.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17267113913.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/2317190677.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f6e46a801---denimepojuvalusajeruvex.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/luzudapojomexuti.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/92616886250.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/18147343426.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b2765e8cdc8bb9b2bdc529a379a17ed2/65901017758.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/24036934766.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c5219142---vurutubelatowaginedasuzab.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a034b58690523094d03f2a9b68e7250a/15111891555.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/863da9be1bd9fd5546190b252fe60b80/retakafosa.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/70689001951.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/pozuluriduxekosalevewu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/37411889986.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/topakimuwix.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/365dbeafb173aee6c7ad88da8f4e9a99/4272006399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+gleaming+in+englishPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1103a8df6266cd91d84d72c9861ad9ad/30757919916.pdfIn PDF document text
    • 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_off0000b954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB954 18128 bytes
SHA-256: 461304ea911684426b2b510c66459abc0b1eff6f17e804b709fb73feccacf19a
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10456 bytes
SHA-256: c7a828f6ad9be27f9fc6fe6ac621dd039a5966e730823f0697eed3b0a67a99ec