Malicious PDF — malware analysis report

Static analysis result for SHA-256 a535ea7536f1e106…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 00:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29bc0343a0e343316301808f5a0549b3 SHA-1: 96d63742f48e5d04357f5d06a8b49bcd1deabdbc SHA-256: a535ea7536f1e10641558bf317ee89f9da2dc63b693078ed1aec2b8ec9d3baca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c15a7ff5---lapojuzuxoli.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f8859d40---tizazibaponupu.pdfIn PDF document text
    • http://nut-shell.net/upload/files/75454427931.pdfIn PDF document text
    • http://dsagco.com/Upload/file/jinalowogep.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/28385722738.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903103644_1012466355.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/tedini.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/88850348447.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/20959316038.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e289c175ee---99212064231.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/risabajul.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/36210593227.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecabd5f4c8---24291055711.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/50447729098.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327f467b155---ninowonofeduvagir.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/somudekikinani.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/gutofafe.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/83464806648.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/zafibusepexadizuferi.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/berefofoxonasub.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/xuvazozod.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3480d7eba6c94a1ef3133530070e4c10/75011411062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=verbs+that+start+with+the+letter+pPDF 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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 16452 bytes
SHA-256: 2e96bdb73a30ff7e13c143148a8a2ff79304147fa9b3889c55b8e93929fe0166
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 10320 bytes
SHA-256: 5861cd86b4f785d62b800571a2cee17db048dc7a8b155e31a79fbcac6e05e3cd

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