Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba48516352f102b4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 22:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ba4749cf712bfe059c4c74dabdf5f98 SHA-1: 010ec76953564990c33dc4fe925ab4e25f0df598 SHA-256: ba48516352f102b489f86f033824c601f433a1dd9b0b8bf95d47d1163bffdbca
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f3a35f15---nevebotobizavuruwes.pdf In PDF document text
    • http://seattledesis.com/fckeditor/file/16440247514.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/lixafokenozafikegeg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j3f127l4kvu7hd33e8f9dig0qc/tusepakitekukoza.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/60161493897.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xebomelezuvolomegivagis.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/wibarilidimo.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/10163170730.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137aeb17a723---mulaledunadaf.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/zofowe.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/7141976157.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/rebinuguvulozanutulamo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/93742442889.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/jodifu.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/75516780265.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/69288851782.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f6f721847f5fb242d65ebc12c64dae2e/37443727211.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/45631429945.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/73148384220.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/tifanavefefunuselub.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/46881533950.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/85613221693.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/52143269359.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149366cd8564---tejipuweninuzimanareleb.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/jupemapegimav.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mafofema.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fbc245380---doloxajariz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=david+bowie+concertPDF 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_off0000b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 17964 bytes
SHA-256: cbea7b7fd1f6edd9b63a5505ca578f3235dbbd6624224218879b763f865f751e
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 10440 bytes
SHA-256: 4bc66e39d2aad0277e58463b94c78adaf9432f4f2d522d66a9ce4f1f63627ea6
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1