Malicious PDF — malware analysis report

Static analysis result for SHA-256 579e5cb2535e8339…

MALICIOUS

PDF

79.3 KB Created: 2021-08-31 19:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 582794d5c7ae49538d47cd80890b6ec8 SHA-1: f93db7d39f81c89648b95eed1747f2771f12c8cb SHA-256: 579e5cb2535e8339fe43022cd75b529fe048cdb854648fcd8251fdb13fcb0952
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. These links likely serve as a redirection mechanism to deliver a secondary payload or lead users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://polish-house.com/uploades/fckeditorfile/kagenezaxoziketojorapa.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1ddef82a---60580740599.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5e4b0c06632af78c1543f552a47b3291/kuxixogejekanoto.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2dabb90a20b9e7179728308f0941b971/83222322121.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/3c5678482d8d0a22282d86b3633b1ed3/78561268302.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108232233539471.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/20263921796.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/6615071229.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/43383952841.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tabidovaxowirev.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/xodav.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/fidekezigolojabusinu.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tadonulitek.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/70979137494.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/83478382767.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4587808e---xapojadodotosogu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3mijjh9n6sr81crsgle8q1njuo/79494381969.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/sn7gbopd85fm6fihqk3n58bdn2/14734003803.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3hsui3vu2kbi2de6o6v3gbjgs6/71374829510.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b2452cdb66c---mojibu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/fuwemejob.pdfIn PDF document text
    • http://zzweien.com/d/files/68114522574.pdfIn PDF document text
    • http://jump360.co/upload/files/20210604155154.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/bonobebegurabigirazixeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=maiden+horse+racing+systemPDF 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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 10876 bytes
SHA-256: 1079feb97a0385af400d16eed7e062693c280bdd6584eb34578f4b94f51426cd
font_02_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 17660 bytes
SHA-256: d438eb9a680cb1d5d68e74d9158119f76902810748c80c153a4ce989d6ef60c1

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