Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70d029c0948893e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 10:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fe6befccd8ae5ec294cbf16519a1f83 SHA-1: 896bf96cdad8c196d747d79e19e9f2c4b5ce92cd SHA-256: a70d029c0948893eb90b27072212f5d8bd52880eb28d36841ce9047c7401c1cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload storage, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://khonggiansangtao.com/platformecom/img/upload/file/96999386007.pdf In PDF document text
    • http://dotykbylinky.sk/_subory/subory/92429002001.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/84854400646.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362ba62520e---28092331206.pdfIn PDF document text
    • https://dukupahit.com/contents/files/pokoja.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/19974793383.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/kipuzo.pdfIn PDF document text
    • https://onecre.com/images/content/files/gelidofesajorozerajigif.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/gimidotakasaji.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/nokudusanadepasij.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d2f71c4c06fed6a7324e46e8ac233b5b/436096584.pdfIn PDF document text
    • https://irrisyst.eu/files/file/wufetuberefafazifokagozo.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/66960103750.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/mapivefapodo.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/11259259057.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/sozevuga.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/44829015648.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/76684719363.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/bagexemibibigivof.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/24526563948.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/lekuxefuwum.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xavidudeworum.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/4546078774.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2a5ac7fc6275b901009ee7b7c1b12cd3/25289259514.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec40190286---libukidenazemezu.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/74418873623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=news+live+today+malayalamPDF 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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 10448 bytes
SHA-256: 38b3354220319c72c7be6a024ca071a8d2c2dfedbbae4376eec1c6488e45fa60
font_01_sfnt_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 19772 bytes
SHA-256: 28a7b8a410fccad6a49f9df4014b8e55e7f9c13d7e57bd3ef98c3eed6541d281
font_02_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1