Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c06984c87f2b9b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08ba2a80a5ec1a0c05d5242dac758b32 SHA-1: 6c6cb307fc2eca8d03d2d697593301cfada95179 SHA-256: b6c06984c87f2b9b8b409da1e67a26edf3e5e2b42e5e24eeb7dc14f3210dff47
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or SEO poisoning lure. The presence of external URIs and link farm characteristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://seasonmediagroup.com/pic/file/vafuvonefifiruzulijarupu.pdf In PDF document text
    • http://tznjl.com/userfiles/files/90316418805.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/99129262816.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/65794048572.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/munad.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/73607292366.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/58681022533.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/junebajidununovexeket.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/gajazeroxedumi.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/31083381282.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bk7phcfk1pl2n8gij0lak5r9fd/gifipejaf.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/78362449308.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/72237893268.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/24891366569.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/bibomemetewubewirizoxi.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/vajotituveganiputewejapab.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/xejagixotonesok.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2efcb4f1f466a7822029555b92b183f9/32640825673.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850b124697---neregukumiwuxi.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/laliwomixuteroravovepuw.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8dbd3a3a3---xegidozesomobivib.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/34178681375.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/xomuwutarasifuno.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zozibonivaxirafuxeb.pdfIn PDF document text
    • https://dacola.com/upload/files/fonotinebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=roblox+2017+download+apkPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 16848 bytes
SHA-256: d3a1f797f1223db5ea5117bf0f6e4b00cee15ad22281047d9c0c87bebfe488a6
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 10604 bytes
SHA-256: d61f5273145d126cf3008fa25ca39b5393531f4346bac5feaf587270f5444a01