Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0321c84d88c000a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 14:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb7e75a4b1ffe6fa4c8431fe72f20770 SHA-1: 3c5bb3e740a40f64d60114b2586263ada93f02cb SHA-256: e0321c84d88c000a8c65e49ccd6d88afa956bc918a74f7a8e5ac4b75e384272b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common method for executing malicious code. Additionally, numerous URLs were extracted, forming a link farm that points to compromised websites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=react+native+barcode+scanner+example PDF link annotation
    • http://clubmaniacr.com/campannas/file/midejawororan.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210908_47CA29F8E596B344.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/93473093046.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/loloviretevukuzarizugulex.pdfIn PDF document text
    • http://my-glc.com/uploads/file/bododozetimenodix.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/83635679505.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/minupixuxaxemefiveg.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/suxatupixekut.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0b1d18138c066d6f5ef81445e0dc0a50/gorem.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/75949275928.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/sapilagokojaf.pdfIn PDF document text
    • http://klhl.com/userfiles/file/duvix.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/lidisokemovarutenuf.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/89596829407.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16144b0fd2749e---94255480437.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/99032172604.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/65979713324.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/50764753138.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/bisunuduba.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/690b959d38449e9a12287127a2307c4a/bononuzorowamuguxex.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/18458687461.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/giveduzemutuwitubuzogakor.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/wewotusapatipazorekari.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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 18176 bytes
SHA-256: 1ca6f54f72d56257d5995fcb6d96bea27f959b74a19385a8d2f9abbfee46b350
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 11028 bytes
SHA-256: a7f3b21c83b35670976184c63a2526e41269c1808e4cb0c03108c1fef1125ee8
font_02_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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