Malicious PDF — malware analysis report

Static analysis result for SHA-256 9110a6b7c4b37dbe…

MALICIOUS

PDF

83.3 KB Created: 2021-08-12 08:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 11fe5d42d86161fa94623a081236093e SHA-1: 6042e47ee58ae614fd88cdbcc960a82f898e65c1 SHA-256: 9110a6b7c4b37dbedd4e9b9106e54cb2a0d385977cb95acbe444e4f2a4c80f71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure victims to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9ce4eb9a1---tuliwolebozunuxex.pdf In PDF document text
    • http://tavaszitura.eu/userfiles/files/wazorisireg.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d7debebec8b95c12c5f0f3bad888a292/sowejelu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q9m0uv9ear6d8sevrndocl0s0j/87689997112.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/diwitewagezodow.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf86fbba06---zofepemixatenedomuzit.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f52e061a3cd80374070faa295acfa540/12438678272.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ladifo.pdfIn PDF document text
    • http://nessium.net/userfiles/file/77732132150.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/kavavamujena.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/56912161a18047c70e9fdc5959d3280e/92223617975.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/52c22d55bfb8c45334213f1d6aba9d15/xekusilamimatutu.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/mibusesisaw.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/denobapupiviberisuw.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eccc741c08---6428730703.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/mesetewikopakupupoxada.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa32d588f38---gasajoferuwogewozozuw.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/rasoxalokomagipitivujet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689897b206---fusofebipazukapimatevira.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/17510769376.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/13129984721.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/19409348280.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160818e2eb052b---kigob.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fa4c9789---29661555533.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/363d13faa20cd9b35f14730274dac212/vafugubutarexuzojenuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ca+dmv+driver+license+test+answersPDF 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16348 bytes
SHA-256: 210fd93347a88d350950f849ef19edd2cd293fb3523ec494b695b79a5433e63d
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 10596 bytes
SHA-256: 6d246b9ef25dce0652918543f27acd1b54da07c5886a3fa86283e8ccdb7bc4d5

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