Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1d2b5becf90ff5…

MALICIOUS

PDF

82.2 KB Created: 2021-07-14 07:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d29793a9bee409f67e65234172149a91 SHA-1: c77780595462bf964b47d0f67c69a66a1d149878 SHA-256: ee1d2b5becf90ff58bb56d2e753a8961497720f0ed38b5ee52c958ff2d6e257c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites. The primary function seems to be directing users to potentially malicious or phishing content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=best+items+to+resell PDF link annotation
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8ebcbca441b850a26c0ed8b946e5293a/ninowosujidolokawofole.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/82374198015.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6588c843---5298529592.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/58806410717.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/bea0ec940399ad7e9ef9071aef06131e/57268456023.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/189e87dc79f93e7096359cadd8b0dccb/tulowevulodopo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3242b83689---31139223831.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/porulusegite.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b94f7f383---tesakanonizutolipaner.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/zutulakuxuxibow.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/saxojizalasogaxixinoregun.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2e1310af8---37334536155.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/325beb011c3046c73856617b7bcfebcd/11482716366.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/42269517.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e980d126c---donazubunaz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg1o2ikf5v912fslq38iiqvus4/78608231619.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a03c01024f0416cb26881cb1db9771dd/63082567892.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/41279012885.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2748f29bd0---sisijisukol.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b420000a187---zonaxaniwotikij.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/80194915152.pdfIn PDF document text
    • http://araonline.hu/uploads/file/rorogulom.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/352b1e30f6c9a971b9ffb8aed6d3f6db/xulakozuregidakizugo.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/8583838885.pdfIn PDF document text
    • https://magerp.org/upload/files/54141851567.pdfIn PDF document text
    • 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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 15932 bytes
SHA-256: f595364c10c12a3a67bfcba9d6b6a20bfcc9a22049bf03f29bcff265362bdbf4
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 10056 bytes
SHA-256: eb24c31571b98238655b9873ae5215d1c4882bdafc407484f87606ac95ecefab
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1