Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3bca1e2b05175…

MALICIOUS

PDF

75.2 KB Created: 2021-08-08 17:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddb96e304e21ad5871a98691239d9429 SHA-1: 8eab1b26473ce8a761662661d5eff75def042de8 SHA-256: 6aa3bca1e2b051756d6eb87659251614f697f14d0eba8264673a8e20604faa28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the presence of a link farm strongly indicates a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://waterreducer.cn/d/files/xosatuzugotulu.pdf In PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/68081229900.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/db995c565259a480a464abafdfc77255/bosamemora.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/96651402197.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5840d0c2362d4cf5b770065dad5d43a7/tivixekekegin.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jb35akgkc7t4hr08p27aff5uef/83441410856.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/82260363551.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77747543069.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076872485881---2471450083.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/lilolegukiwideb.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/31671340192.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/afe25c0da778750338e2ad88f033b934/dopobetorijiresili.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607301ec5d6c7---xopuxazitonubenirifa.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ada90063c---godikijorezur.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/66739142061.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725eb733443---24793062211.pdfIn PDF document text
    • http://agro-partner.com/Image/files/13601936947.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfb19c5ff3---38475549654.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607700840ea34---xedivoguponun.pdfIn PDF document text
    • http://erpos.sk/data/files/95638248635.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f266e4f3bf2---resiwojuwubusogovagebeb.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/12445e95eb270618f395fed35367a257/8277926883.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/83d92f7c2ba4ab9fc42f69d19aa97788/lisutilefokulogelitepag.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210619_174950.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/mokavamofonixitijulewu.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/xiworutodiniwi.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/99221560541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mercedes+benz+glc+coupe+owners+manualPDF 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_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 11044 bytes
SHA-256: a86a7fefd09483440c8eea609f4d5d574f87b52ee3a0f649b9218a5fca28a234
font_02_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 16004 bytes
SHA-256: af8609ed071d28d71d3e850d07b3efa987fe7cca3350af060f72147ea113cad1

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