Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a53e6c6b5d2aed…

MALICIOUS

PDF

79.6 KB Created: 2021-07-16 15:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27534feb5c19b45d2691a6c5252fc881 SHA-1: bbc18a46e2f89227059d75a82754a2574028a3d7 SHA-256: b0a53e6c6b5d2aedf829b270918d041e7513ae05ee53f2d5d4d44106a35f924a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=oxford+discover+4+student%27s+book+pdf+download PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/280746f5d62592fd80b7603024805754/nomija.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q2c7dc67h1f1ks6s1qm0ki5ike/66712863856.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607358f5419f2---65308725143.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3qfugg3tumt2v4el80q1a1dc1/xotimuvuj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/k1b05pm9kn7kfjk3dc3klfhp32/93225784455.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f96c2bd9cacc5e50968922d8e1ea72bd/sijopotoditibukiboba.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210531_A7873C5BDF1D4834.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/30356853225.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/13o75kl5ffarnfb7ibtstih1mh/8046966971.pdfIn PDF document text
    • https://autoparkalbanese.it/file/jaguzu.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/27380580066.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/79711254405.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/16500211089.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f8db1795---6240042070.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/45038100168.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae8be59c4---41145703324.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fumruilfa2co3qcfandm573juf/wirivenojukava.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/30618213882.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b66656b2---xuwapilop.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/laligufumesotu.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/22306425148.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c25233a---vimenedozelobe.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/51389761535.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/dozefebaraletixefudunuz.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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 27116 bytes
SHA-256: b5080867dcb7d77618d6f5a408eb15de8986e87c77f6c45da14df84d1e3f7c05
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 11336 bytes
SHA-256: f7b8eb1cd527ae5f08109e3315d5bc5f1b2178c9bba9db8927a0ac30eba7a77c
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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