Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c1ebd43941be59…

MALICIOUS

PDF

87.0 KB Created: 2021-08-11 17:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7f3f85622fc316d07af5e50e48884029 SHA-1: 47004687b4a94fdd3f5e284c92e2267d099c0ed2 SHA-256: 87c1ebd43941be59771a2159d89d4b43136578b531904da1c3ca4c2e7f9a2f7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://driver-jazda.pl/upload/file/wofuxalawoxebelix.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eoql8aqb087l0plgtm63lj19q8/46212899859.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/19732763275.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fd66a1114b527b6f5eaa069e4d503e6d/juxapasatad.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/nibalarisu.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/timesisumineto.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/88746502728.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f300576c---17338258142.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/mokedijow.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7401d12469---19241072448.pdfIn PDF document text
    • http://packturf.fr/files/96485222824.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/munulixajela.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ef5658f36---kelesomevemefepuduven.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/79469669078.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/44712699346.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/9277706018.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090fdc0748d2---wirigodubizenos.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wakopazisej.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429110251294719.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb5676bdb---44960859131.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/dubekivijapov.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/lorimewerorosimobudafef.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e233222a7---80005512632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=yen+endral+un+pirantha+naal+mp3+song+download+for+whatsapp+statusPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 16400 bytes
SHA-256: 3aec09ae803a7a46ae413df02c8ca344797585bd6840ce04c938b57b656bb6ae
font_01_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 18216 bytes
SHA-256: daa67256a05c820078073ba3416e954b336462f20b2c55764be375277054e38f
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 11284 bytes
SHA-256: fcd44df040ac70d9aac4a26e8bce4341a081b5c0235d13785f7ead0b74aa30e4
font_03_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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