Malicious PDF — malware analysis report

Static analysis result for SHA-256 32061606f1d5fbb6…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dca75c647b7d37b223b73b101cb521e SHA-1: 2b3ba3baf1a6e766c3608805881d43faf8737611 SHA-256: 32061606f1d5fbb6e685bd6f055b686cc404a99ac6fe97b253b814c44972901c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autopsrus.aerovents.com/ckfinder/userfiles/files/21004740751.pdf In PDF document text
    • http://jonellchem.com/upload/files/49781038080.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/95378839870.pdfIn PDF document text
    • http://hjhchem.com/upload/files/69354492791.pdfIn PDF document text
    • http://chinahongji.com/d/files/gusulabozev.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/80201524936.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/03c76e28dfcf37f3b6834f7eba0660ad/76102755393.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/73325599007.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e079b681f0---marivasi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21c74037b---82094271831.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/96173177097.pdfIn PDF document text
    • https://alkoplast.rs/files/givaf.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042a26572d---taxedugadunipogu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/84867648182.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/44485963138.pdfIn PDF document text
    • http://c-six.it/userfiles/files/80976538150.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/27664190858.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/32576606873.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133de2cd29c2---fedazixozazilufibegu.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/jigulalo.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/solifamab.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/limefifagonul.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/61481553035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+online+free+for+ps4PDF 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_off0000b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 14384 bytes
SHA-256: b54c2df0a16f3f79372f61f6590beb3cd7725d1c1f13e5c987f5282ad5fdc23a
font_02_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10468 bytes
SHA-256: 7dc15bd1618e34b67a52f7b26cda34cb35913996cba98ff08a7200423c70e919

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