Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4d88ae181c5cab…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 03:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af6c2b4e67ff43a2acc938bed22e99f4 SHA-1: c1ad7baeb4a69abbd3b6cfe793826c2affcae8c8 SHA-256: 1b4d88ae181c5cab7000107f839af0a79ed1e90eca53ade92607a60830f58585
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or malware distribution, as suggested by the 'urgency lure' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=can+you+refreeze+ground+beef+after+it+has+been+thawed PDF link annotation
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/sizifabodumona.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/30238039825.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/56520187009.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/nofumilimixakepezapid.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcef0b0c3a---zabowepomoxafom.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/30463891155.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/tobaserafefovetumofexase.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/sidazorovamumovape.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/17691598908.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161587af64793b---92672408885.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23dacf466---44326219664.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c1b82549d5---40438314525.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161305a6527b15---41790847235.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161519598eb367---52770260727.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/jupebidopazezurokifurimo.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/14184379193.pdfIn PDF document text
    • https://adium.ru/userfiles/file/kefamaxugu.pdfIn PDF document text
    • http://dalaichau.com/files/xolizasewasalofewaz.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/51329774829.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/96349888661.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/lodasoruwefamu.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/rabusoxulubobizunafela.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tovijebitujudoz.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/41594689523.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 17468 bytes
SHA-256: 7491c6cd4316a94bacc6ce4318131376d1ee6a81029c3ff6cbba5c05c34a3bca
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 11120 bytes
SHA-256: 70c3d9babed6e51622a3ead2e80c7a4e92eaf7d8d795c5b2cc36405eaa91aa20

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