Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24cb8981e67ddde…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 07:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17b1007ddf0923147bbf0431b1def95a SHA-1: 1d29ea35e747dc6feecc257cd7e663b03530585e SHA-256: c24cb8981e67ddde18ce96c8d65dc1763813cc255c76f7d41e152960e5aadb81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards exploitation for client execution, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://samngaimarble.com/html_upload/file/42171342956.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///wurozotemisefoforof.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/15110858403.pdfIn PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vozewunonot.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jt8qfg44hhd211c6g0j0s6755r/53841005387.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/zoxizorekare.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/16312821189.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/oqaj78u8riu4b4sakumolehjj1/3017726181.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9a43afc61e25738221a8a7adececdada/94663572353.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/55906358318.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/jajipinoga.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/69878091029.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6298c72e6---tedadamekofeniperun.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076edb4106f8---zufugujazewenumekotisek.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/564399880.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/titojogotirurisata.pdfIn PDF document text
    • http://digifast.cz/userfiles/53472100482.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b1c722b005e4272ad052b1377a884e33/tekezanoresiforaloretal.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ci853c5gegopcqq8sn5r4n7l64/43141849344.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ab68bf9c---vipukonamakisuzaxuwosu.pdfIn PDF document text
    • http://mmt24.ru/files/file/54289539829.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2c69960a---47242653020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=formulacion+oxoacidos+ejercicios+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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 10992 bytes
SHA-256: 2a230f0d882883a09d224f1332aba8ce8171b7c326a5ffd7cadde1cf9728e049
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 17988 bytes
SHA-256: dd94163689068bc131ca14bf126bdc0d22f211b15f0d4a12522c423f1ccd8712
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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