Malicious PDF — malware analysis report

Static analysis result for SHA-256 173d1d08b00beb97…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 02:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86956a72a55800932c2b1ceeb7d38c7b SHA-1: c4fa5936502899ceca49db666111f62ef7986d92 SHA-256: 173d1d08b00beb974d0b8aa33c233245cbb3ae41dfcded65862bd8feb855bb53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm, likely intended to redirect users to malicious sites or for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://t2sc.me/userfiles/jeroxexog.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f1174b05c5d5d207dcf1f8fbf13666dc/55403642845.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/67674941673.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/12843283922.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/93232515493.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/37b7f47f51331446502683fa136a85a3/38620021051.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2261024b621c302c6a0ad1b90d0aa887/51551843773.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/3930599044.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/jijogizigixotofavolegaxi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161327659d89cd---91831993913.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161338310be884---13939866098.pdfIn PDF document text
    • https://rcot.org/userfiles/file/44454055611.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/14399724109.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/boxeluvawegaf.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/fuxexodujetimikekozan.pdfIn PDF document text
    • https://aneri12.cz/res/file/54860646510.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/13583196603.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/23997640386.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/58384275943.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fa7d1481e118c1d3b2d86e49598796fa/didepufoguv.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/56407783117.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/03/18945182831.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/mafusibudojegukowamotada.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/jinedipono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=who+saw+my+instagram+videoPDF 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_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 17760 bytes
SHA-256: 6a7f20347e5479351e44756454f6d3a6559a5bee1f6a5ed8255a662818787430
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10908 bytes
SHA-256: 158f20cf8af1b60bb3e3faa5ada4357ae3d88d3b40da18a41177ce98718ed528

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