Malicious PDF — malware analysis report

Static analysis result for SHA-256 6090ff492a933663…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 01:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c74e4a70cafdc837fd9002827d93627 SHA-1: af42e6dc6e6745a99d87eca163823b1aa95f3aa3 SHA-256: 6090ff492a933663cb0f24b8576c5879fa08549c5726fd92e7f0e236674b7375
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seo-methodes.com/userfiles/file/vuzosawifutukope.pdf In PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/velumosavujaruwigonaxepus.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/59088474931.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/barenidabuvomisadozusen.pdfIn PDF document text
    • http://tianfonmm.com/d/files/52516457006.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/55439785780.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/17449698030.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/3921612131.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e5306233---lipedivuwavomilatuto.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210902124346.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/wabexulutomezaped.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/pizijijuduvisixuko.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3dc1249e8bc533240602c5b464807555/31876176665.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/17/tujoraxu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/dafifojiwuruvab.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/23559441510.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zukotitapatobujojiveku.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p2n0000pbqoc4dqgmpr1hcqgp7/85646807512.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/tiwazirefikumesesumigazir.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/75805480748.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/12894255065.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/wulab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mr+nobody+movie+watch+online+with+english+subtitlesPDF 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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 11316 bytes
SHA-256: 3a7e1f19cbb9ffc8b2883ade0628f1e92a193c1de575ef591be2bf624d3c0ed7
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 18092 bytes
SHA-256: 2efb336a14ea6aee3535b6e1aaa71e5ae2cad804cd6be9d0bf5a2ea5f57501c0
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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