Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df3597e31fd62d6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 23:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78f5e803fb35db4ef7ec8f32724ea118 SHA-1: d5387f5f6106345814f627c764ae0f3eb328558f SHA-256: 6df3597e31fd62d687ec9f375a382728d0ab993235c1d9eebb7f800b5f2da152
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://nt-module.ru/ckfinder/userfiles/files/40999827851.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132030e07d7f---jezosijupu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2572dffe---terilisivuxenejidukujoj.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa774975c---75327841340.pdfIn PDF document text
    • http://sungder.com/upload/14026430352.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/fawepoteniwexipuzax.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/garivularaxiruxig.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zusitazotoruk.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/fawevewusajigekenop.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/tavodenijawixaxas.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/midofefixam.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210910010003.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/91065211346.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/bitanupomasuwoxidimuvusif.pdfIn PDF document text
    • https://nomortiga.com/contents/files/gevelirebaxugutigenusep.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/desowabuzesekubamaginep.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ebae4bc54---11803972004.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/44240238489.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4459e1cd---65006241380.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/gijaxejadosuj.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/61616139539.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/gizirelidosamurimedivur.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/segegoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+villager+modPDF 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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 16716 bytes
SHA-256: d0acbf1f0a70332ef13986222de540dbca1c797ff27b65ef26f8d9a25f8988e8
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 10708 bytes
SHA-256: 6a228145919780ba8ef5001848e457d012bfe07bb4f266a954abe73ac65cb580
font_02_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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