Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a469e135b26822…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 00:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2178753841bdab169c4466cedcd753b SHA-1: e8960081f8f3d79e7a75aa018de5d21361d4e3d6 SHA-256: 16a469e135b26822593a50217c5ebd431af8f7b62331ddeeb2866f71c3261ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or distribute further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm, potentially for SEO poisoning or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983b4d4f4d5---papobuvopazokego.pdf In PDF document text
    • http://noithattamphuong.com/upload/files/18040424355.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/davox.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/jalonusezovof.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/teruboleb.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/70887732597.pdfIn PDF document text
    • http://vinmexindia.com/uploads/76968035018.pdfIn PDF document text
    • http://enkepharma.com/upload/files/vebebiv.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210516101523.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2ef63d23b5e60bc38ef1cb9fc143f510/zutumefuzupekisenor.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c488d047197---novitiw.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/822654265.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/85602477070.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48d02d629---vibolew.pdfIn PDF document text
    • http://cy2hand.com/userfiles/sogarod.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/vulebukulubeziru.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/sujupebazevulovisokozoxi.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/13486354182.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/dipegipufaroturejewifip.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r0g57sn9khtafq61set4lgs84c/62917385980.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/19921120601.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/36f2f201652916c7150a30a3902adcad/7547432212.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210821073156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chemical+kinetics+class+12+ncert+notes+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_off0000bf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 18548 bytes
SHA-256: 068467fdb33281377b86db59fbece848120f19324743ef426a8e076d8072b741
font_02_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 11180 bytes
SHA-256: 199ccdc2423ca4613122c4d69c76553d2f2a91e9a0eedb4d58e8525f60be6385

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