Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc0393c5dc53bed…

MALICIOUS

PDF

77.0 KB Created: 2021-07-01 19:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 257eaa59b6481ea546ace3d7efb2491d SHA-1: 77ddc9ea9ba505b4d3ac2ce6167c693c82041868 SHA-256: 4fc0393c5dc53bed1b70b3faea6cbedcba605264babd4a094266c5c4511dcc05
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071fea0e6679---julakiravavedusep.pdf In PDF document text
    • http://gpszone.hu/upload/userfiles/file/zipagoj.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/15187c83307dbc8f368b2d603b91af3d/pogipolokigetakaf.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/firesolina.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/jujolufolefukamu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4400220d---7763539672.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/rozupimofuxolejo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da318e5ffad---61073663515.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf137e414e5---vibeboduwurodidapadivi.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/17244761124.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd228dea2b---lirem.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/taxazavewewuzeru.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/jexuduxutejexuj.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/domonisu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1a9nji5l98vlan9e46lsdiak61/susitekoto.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1367312842509c321b0536f5d2beff0/woxolikenat.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd358f816d6---kuroxulexujutitakuzigu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gowobajemokudakabego.pdfIn PDF document text
    • http://ahchala.com/img/file/jibewilebajosufasad.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b167ff5133f---17958998006.pdfIn PDF document text
    • https://avvocatoboretti.it/file/78285083003.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b6f73e7d133d72805a89879c1d45c0f8/10339204777.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6c6c802ae2972ff8c2ff609905578033/pewuzadoj.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/91266091274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+english+grammar+book+for+css+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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 11352 bytes
SHA-256: a8bb0700defca7f0426d734d6ae5feb93e2d2ab2cbac63aed0a5f1f32c537b5f
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 21440 bytes
SHA-256: 43f3eadf56d47e2aff052ea19d23ff032e397460babde5ce15f1bb09c4e165cb