Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba345afe8c3c5b0…

MALICIOUS

PDF

97.0 KB Created: 2021-07-29 22:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5cd55ddf7fb1ecbd2b9a19aec696f85a SHA-1: 0fa2d51c51e03fd536aa18593309a674b3e15180 SHA-256: cba345afe8c3c5b05f9eee6779a7ddfbe6033d7f58af0f86a3ce0e34981a3fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=vw+polo+6r+service+manual+pdf PDF link annotation
    • https://ktmcollege.org/public_html/userfiles/file/98962055021.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tc2m5qh57j6j0lg89p0bfmfeih/sojuxi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c561534386---983803585.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/bowojuno.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/pupatoduw.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/82009088492.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/rinsmot4uoj7nsnjn82kkbvfcp/busufilopobu.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/71442592090.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/diliramivetuwinikelo.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/1087891264.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/57479059624.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/151a6cb993ece5d6471d795b30d2950d/76809990186.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/78847756242.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e717d43a---35457062795.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/64327881702.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161054285749.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/18644702526.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/46dgkiu6dpkpbooir1dv7t6m1l/tuxagowe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608150c099891---27602811791.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/wizekosikumojevupukuri.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/bumukilepusekapuwekazani.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/75542631184.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/juxemo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bf0c0a8e4---gezurikinevuxavufik.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/dolojarefobizoput.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_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 17760 bytes
SHA-256: 12ebad5902bad5a425f2e57e0b3cb7ee2af9753907c2f45144aefa2ca183e7d5
font_01_sfnt_off0001427d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427D 11072 bytes
SHA-256: 9eb1d4bc93690b25c2dadfa80835292626e792f1fb8acd90668c387d2a9afdc2
font_02_sfnt_off00015c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1