Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb461be6a744067b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 07:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af11a3564adb542a20f25b06a00ac15e SHA-1: faba99a22abe82820d53dd1a7b5e3d662f94322a SHA-256: bb461be6a744067b036d9f8a5bfb60f366e81728a745dfbce7f5c5e4651a0aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=statistical+significance+alpha PDF link annotation
    • https://nikunjfoundation.org/ckfinder/userfiles/files/71478550523.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/jawatomuk.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pvnfus1sjlabta353cbu543mvo/munurixomi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/21607458936.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/26298847776.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/gasirofeman.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb9beee04---pawomawadibaxazogonu.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/80724151993.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rh0e1bju373ndg7fceunj197je/33191668289.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/43468376971.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/niwutomasutubafezobolok.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210822_083001.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088f480272ff---losigi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/23114144393.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/7827966998.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/kgeb0oqsjscq93hqcl1m7u9bgq/nigenij.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160706c96dc8bd---wojipurebilovagunixa.pdfIn PDF document text
    • https://wita.lt/images/files/47558742105.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ok67sq17rip2rdc435fdqpas6l/94463064137.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116ec7ee08d8---dejarulawowimosokidolali.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125ab485654f---bamike.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/12842773691.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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 17744 bytes
SHA-256: 1a66ca9946fd66966a702cf0adfc3ba4d92e5dc96c9714da52c7d99f9b7771bb
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 10612 bytes
SHA-256: 8761369a9a02a8c39c63894d267c4923d3ceb3c9262f9b525f1d67375dc43d02
font_02_sfnt_off0001359c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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