Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99de3f272e0a704…

MALICIOUS

PDF

96.0 KB Created: 2021-08-10 13:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5515f484a4368530ea76b2bf5e541b70 SHA-1: f8f494da09d6c735f542238cee4a34e4139908d1 SHA-256: f99de3f272e0a70488de96b94435258fb45da66d43e5b2d2d6a988a3e59f67e5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The PDF's structure and the presence of multiple external links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=list+the+different+types+of+terrestrial+ecosystem PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/xoniwemekotuxudesifuwoj.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/dotavitavur.pdfIn PDF document text
    • http://hainfelderteich.at/tuganikarusinem.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160869e9e99869---jikefegoji.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075810cbc2e4---girixebagoxodidudut.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5doehptmv7i14d4g5sism2r84l/19812086853.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d7f47e42---31000689031.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/69446559703.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610af9df5cd6c---xuvolesosux.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fubenozisiwe.pdfIn PDF document text
    • http://thedreams.cz/files/jogelezikupa.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/36885412264.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1887e9f3---85169920890.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea45e3bda2---dabimijera.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t8r79fgnrqucdqmgaamltpca30/wudixisutujubojeserivego.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607093330b7fb---ripogalejowik.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/62280870392.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/livkcf0gu1sqo4iv3omfa2emcp/zobuki.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/nudebarinojevesibezejev.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/58353310717.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a930e0dd5e9a185acaed6c37e7fdcf18/97000182443.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9390df1a04---13849089820.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nvcqbq3se6e8cpa3fue2hd166p/sixexowevetatazogujujam.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83002607da---11556424906.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_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 10956 bytes
SHA-256: 59b0be3e193f3f3b456e2c130b76c0e56b5da49cf8dce24937e9affb085e27d1
font_01_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 16488 bytes
SHA-256: 359f042cb606813ce50cb4aa1382fcfd7488b08ba27afaca9ca8aea174d8229a

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