Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0650a5dc527657…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 03:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04d0c6ba6506c70be47edf38a63319c8 SHA-1: 062b821c005f74ce182d6a8131cf984d3116a850 SHA-256: 9f0650a5dc527657d08bb7628270be5a4a45f04eafa805e931772f8f79a4bc8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous external links, many pointing to compromised WordPress sites or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=1337x+unblock+it PDF link annotation
    • http://kleiberit.ru/files/file/92581627909.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/gelexudebiginozefenadexi.pdfIn PDF document text
    • http://szjg.hu/images/file/zimanagezilugugesazamiran.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b905f5dd56---zedivolid.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/16651832875.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/dunozevelo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/lorubi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613767050ddb5---476309144.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/99470872113.pdfIn PDF document text
    • http://wami.cc/data/files/9861900535.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe68047c9f---kudadaranowafuna.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9dbfc45c24cc1f422525abc008beccdc/36546185253.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/zifavasilunobivow.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/wogafejuzolazixo.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/jimenajobonidemisixu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e8646a7a8df8dad90a9076f51613d2ee/87564168032.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc152829a7---3792733092.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/zetibogamemajojizutiva.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kuwaxakizulefazidara.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/zipud.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137671298dd5---zurofotekuzux.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_61638D3CB8645AA9.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/99527950137.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/51979034512.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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10272 bytes
SHA-256: 2faa3bd24dcf7e42d74a4bd5cfe3df5dfdf421ee58837dde0a1bee07f367a2aa
font_02_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 18584 bytes
SHA-256: df64eb4e68ac95ddec175baec927e40fbbd8289b74e11a43489a471de2a8b65f

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