Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6837d8b4e63720f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 06:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 636d639d4b902911952699c77d50bc46 SHA-1: 68d95a1862772932f2516b68e8c84a23e2290849 SHA-256: b6837d8b4e63720fc9f2614663f2fc638386b067d607088b0b96b0ee79ac992f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=ltc+80+fare+september+2019+pdf PDF link annotation
    • http://novussiteyonetimi.com/uploads/file/dopogaso.pdfIn PDF document text
    • https://invest.pl/userfiles/file/govuti.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/xotelugilegavategulow.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/83203010914.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/56acad4e42e69de711aaf63534d50c38/54469522972.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0d563762---ligujuraxiranukizavowe.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7952f6c50a---59484847244.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5d71cbe32a1b1d8708170a1b5f623cfc/pukegigusarokisi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb87a5ec9---kimevedebax.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/fojovazosepetidininidazu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/mimigafaropodivomama.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/83916774297.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/37956ca9adb0fedcb050fc50d0a3385f/34364432688.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/72148612364.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/43362216277.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/54075981946.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16105eb314a423---70472283460.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/dozulanagidawulesak.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5bc2c2184d3c187508424aa9e07d6cf2/nuzumetuzitedesobitegol.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/mobivewadal.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/34037351564.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5e311e3dd876906d08c7fdab2a232c66/dimovubowafazevirigavoxat.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/nagavafekuwarula.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f9f2852e---49149811254.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6085d7301---7425892915.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/fadexofuno.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/vawuga.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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 17276 bytes
SHA-256: cb88b1b1527329c03bc481c786febccc9680568b9480c11f7b4f04106897337b
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 11184 bytes
SHA-256: 361d943ec60c0fe8d906b51d7ef4286ca255e28325806404d1067b8c7e161e08

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