Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d802f4d364b0c1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 02:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a22e17d4e835d4c6159a6e445320d71d SHA-1: d1455ec9316fd19ebfd1e89f2326b33f734ed71f SHA-256: 62d802f4d364b0c104e2b1f00d7b7e4e8e78714a051f5a2a813eec5472153eb7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such documents for link distribution, likely to lure users to malicious sites. The presence of external URIs and the overall structure suggest an attempt to redirect users, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://studioingegneriavaragnolo.com/userfiles/files/71711653189.pdf In PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/17349991221.pdfIn PDF document text
    • http://bodymart.in/ckfinder/userfiles/files/zetap.pdfIn PDF document text
    • http://leruichem.com/upload/files/84350491281.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/gigatumorubeponepazojetu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f1401d6c---57415545454.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/fubusabagabadobabulegi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f4fd67675b3a59bfcc9d4e94d90a6c3/vuxajurimodawosutifak.pdfIn PDF document text
    • https://songhong.info/userfiles/file/59225226425.pdfIn PDF document text
    • http://vo23.ru/upload/file/20854159464.pdfIn PDF document text
    • http://nanopena.cz/upload/file/xafabaxututakures.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/11861655613.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/jigalimiliwukalowafawi.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/27634924924.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/14272652141.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/fomezokolilurosenufikuluz.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/totakegudujajivewet.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kapikuduwusigop.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/2892454884.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/76521e1eefdc977db507452990f0aa4a/monobepuxifikami.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16145a8622115a---17458171594.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/94128395541.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/mubened.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/93538660298.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wudofoz.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/varizununitajipozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=high+fidelity+full+movie+online+freePDF 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_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 10744 bytes
SHA-256: 9e632ea9e92aff814ec263e4619d6f150023884194f15ae1138674a6bc464603
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 19792 bytes
SHA-256: 290e42de9c69be7571aa6bbd6a873ca8cb0ebb82c491a478f43d6b9722237cbb

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