Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc85ceda21abf29…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 23:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae6c98e833a84ff5970f13503af4472e SHA-1: 8845ddd86231f969516036eaf98475db1aa4d833 SHA-256: 4bc85ceda21abf29f8532204af64b0c2f816308e69b325ee198ee0640fd8d141
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The structure indicates a link farm designed to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://mailing.crpm.ch/ck/ckfinder/userfiles/files/599393519.pdf In PDF document text
    • http://zentrumok.com/userfile/files/fudokavopubirotutawemovit.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb85003ff---tatezezilozudevalujob.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/virixokalulorikufukedu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/fotonefexevipuzotewafaze.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vamitazogixiramutopow.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/wejojoduwowibapuvepup.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2745415fb---10920600304.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/koxoruvataf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee3fa029e---geguxuzibodena.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/98e84b61e2675d360ab4adce67c40be0/litulimarofedudumemaner.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1528d5a5cf---40688874260.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q8a09o5g63obbvvfk18ms58j9e/girugoz.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/sojud.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/80649533499.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/15334812988.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/30007af38784ad8509cf201b99c95eee/zejigisalowesoma.pdfIn PDF document text
    • https://birotex.rs/images/files/daxujelate.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/55168983586.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb3298f69---2564148552.pdfIn PDF document text
    • http://lulanjina.net/upload/files/tivewemasobitodilu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba5754df1---derobifomurus.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9f819d5854afc7ffa2fd413a33bcf427/86157820743.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/xigosek.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1b46951db8bf72bc2786a985c4684c02/65113602306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=piaget+theory+pdf+downloadPDF 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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 19112 bytes
SHA-256: 7857b21e26991abc1918d5256b28797fd3573dfc658f6b6faca19b907f7ccf67
font_01_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 10812 bytes
SHA-256: 778d829b68ce82f0b514d8bbacfc6f7219ca070b2679449f11edc88e05ae40b4
font_02_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.