Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e393482fcf033e9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 06:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0834f6f13f84c418c49fab3f4b1e1776 SHA-1: 14f35870120d520b764cae93c40804ac14d7a7a9 SHA-256: 7e393482fcf033e986eb68959f88c1f6d0c09536441d791c509210a37d4e2315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://infrive.ru/uplcv?utm_term=watch+queen+and+slim+online+free+megavideo PDF link annotation
    • http://viorina-deko.com/images/file/4582870765.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wuxurukupavaz.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090619385073499.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6888426e16484325c05970de2a56288e/kilezore.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/bejesewefozowasolofupugo.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/xazix.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/86721315071.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/jetewulotobesonejonozozag.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f009956bf3a3b61b632c6340a7b01310/bokaf.pdfIn PDF document text
    • https://afayl.com/userfiles/file/73743783920.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/finezit.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/pugavelela.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/2169463698.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jonix.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109060506344843.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/piroteletutazijare.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/94326616175.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c991ebc0---72589408803.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/45635870761.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/tazamereparuzil.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/84383392250.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/50111706616.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/57785270695.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/batozopafuxatigemani.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614058ba33df3---25882854839.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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 20232 bytes
SHA-256: 2b5b99cf98d9ec08fb3ac5aaa835e2db735b086eb2edb75d3d4b0f7789b7a47e
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 11228 bytes
SHA-256: ae53fefc8cf92104491ab5a24d5fea2ea0378ab29164404bf2a0eb2ab8920ff6