Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f1259b8c413213…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ca84fd2907a50c32c2c724d56a80827 SHA-1: 179a7f57a60063c1606b0456ccc7e660966b310c SHA-256: d1f1259b8c4132134f59e5028bccc5e314ece547b29662e770087e0059c8ee43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

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://garglob.ru/uplcv?utm_term=inshot+app+to+download PDF link annotation
    • https://magerp.org/upload/files/14930245588.pdfIn PDF document text
    • https://fond.ru/userfiles/file/bebefedu.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/83334447103.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/bewavobobovijokukamiba.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/98372561406.pdfIn PDF document text
    • http://congtyvima.com/images/Download/dafirotenevenelewutezaru.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66217621057.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/47419946856.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/1519895659.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcfc481cf5---kunuvaxuzukofowinawosiw.pdfIn PDF document text
    • https://fong-cai.com/upload/files/fexakeremodemitixekesi.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lunoso.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109200214373555.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/14526702968.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/lufid.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7ec64b128a9c870d3caf4c3f11e140c0/salifeduzoxako.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/50855861741.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109051848481756.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/tarobiliza.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/70680372576.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/busopi.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/mutozinamozowigomu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/831fcbfcebf4988a4d88b4dec5063196/35540279377.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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 18052 bytes
SHA-256: ce5c69f295083b20b2a7f71d74e1bfec75ea2052d7cb21a80e8732b3b65e462a
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 10200 bytes
SHA-256: 0a4cc9189979978dac0e3d39aeb78a271b32ee0e5058149f1fff1e0856b05707