Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a1427fb34c057f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 22:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a751f076ac5c594ae928618d37eb6fd8 SHA-1: 7142cd3553f775e1fb1bd9000833232bd90d0c21 SHA-256: c1a1427fb34c057fff41012093467d24452bda4a93d5af3a16039802e938b88e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious or unwanted content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=dream+league+soccer+2021+kits+apk+download PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d798f3---84487135297.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sesuluge.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/23948091956.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/11/4815509840.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/989153285.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/52572856788.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/kipowoxasetigek.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sunugemi.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/42995296279.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/momes.pdfIn PDF document text
    • http://xycrusher.com/d/files/7884394685.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/zajazitorapopetilogeta.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/74448068665.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16136e94b9a220---notowevomiravo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/89205970062.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/bijogatowuwewaxizof.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/59275489094.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/7839211928.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d927f7b063164237b5f258ec376eea68/sonuwafal.pdfIn PDF document text
    • http://holzbau-napetschnig.at/14283357056.pdfIn PDF document text
    • http://canvangdientu.com/images/file/podiwalo.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/96900552039.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/16945868174.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_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 11428 bytes
SHA-256: 5f827331ff90ec6b862e3b956df5913c8602c4d2fc39f36e65d795ee2d550ef1
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 18496 bytes
SHA-256: e9e9fed8190c66cd8202bc006545ffdb1471cc21ae1aab7bf3143567dd01bfb0

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