Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3522673987c7256…

MALICIOUS

PDF

78.1 KB Created: 2021-08-07 05:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d173855d49dd6ae0fff40ed541fa11cb SHA-1: dd72110d63bc106a5e0fb3006199e307dc051f84 SHA-256: d3522673987c72562611f5d77e7c4b663a71868acb6864a5d7302f5ed250bf2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination of the user. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the nature of the link farm and the detection results imply exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bi8p87fbss8j9gujmnvtnue5td/redetexifozoxabul.pdf In PDF document text
    • https://prawobrzeze.info/userfiles/file/kefodizo.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/kozaxagewife.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073acef5bd70---zexasad.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ddcb395c8f5ec70ff72e3486c00c34c3/vexof.pdfIn PDF document text
    • http://lawngo.net/fckfiles/45516754619.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80f7101b5---77898155124.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608638c576887---vejusepa.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ip57l0u6g5islkgochk7jpcrg8/34833717103.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/xexitumur.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c68032382---vaxovifisewipepifave.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/bv552lsklp20j6jt611oed3b73/kifubaxipiwis.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/52558852963.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e57c025eef4e9e24e8e1032b722b98ba/79846138480.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/lovevesu.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/dirugu.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/mosipe.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/11583297442.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/894ee5b73328655b2afaea488211551e/razozivekevizufuzupe.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/78192705301.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b2e0175a---dimaxuloziwuvobejusevake.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/19178968275.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab36100f2---86807582826.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/29372481109.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b2fea01f---86298550907.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fbeb3750e9865c15b770b168a921755d/321642744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=blood+bowl+team+roster+sheet+pdfPDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16620 bytes
SHA-256: 80dab64e5f10424186bbd239dfe61b0441a7b59a04dfe8e18edf120665f868e0
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 10844 bytes
SHA-256: 13587a3e17128984523d7e0cd3f08b1132409e9b16765b03c0bb56db866aa395