Malicious PDF — malware analysis report

Static analysis result for SHA-256 589ecc274db5ef52…

MALICIOUS

PDF

77.7 KB Created: 2021-07-03 17:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 914b0e2c3e45b1f569e0d6343141824e SHA-1: 2055d8ad5714e3d3958abb9c019bda40e6e6fc78 SHA-256: 589ecc274db5ef52662189582a3c1beb1ac1a9176bd67643e67367307c441bdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8c064f63d3021cefc5a26ce709b23f4b/25199307280.pdf In PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce2cbe650---57291276300.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/60315499812.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8343888e---91397455816.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sovuge.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ju21s00ahfv2ckfiq7ei1qgmlm/pajotome.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/477237e3f0fd2c49e7be8dc6cdca8ef2/botosa.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/58192049599.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/89592106909.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/32220826726.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021062414462673499.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c0c8b195---36880664063.pdfIn PDF document text
    • http://chapelguild.com/images/usr/wixow.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9608ad4c1---51589197384.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/ladujilujagerobinut.pdfIn PDF document text
    • http://df-foundry.net/d/files/86597317026.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/19859878229.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607632482147e---tudud.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4031738a---62772307483.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/9ptg0lbh7m1631q8922ehsapbs/wodurulowejalabaxenusulu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1555c06e07253ad16548f58738c33ad7/nisuwisogavapo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cf056ef3---60170152680.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9755b868eaef96aef1eb450a312a6663/79679019415.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/76680410478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rising+action+for+the+most+dangerous+gamePDF link annotation
    • https://mediaget.com/userfiles/files/25117421878.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 11024 bytes
SHA-256: c6405c95539f7487efc1588427f268558ddb291b65d54b4697bb6781b0df4b00
font_01_sfnt_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 15680 bytes
SHA-256: cccc42c1c9fb9818de220ece2f5ecbe1d5518352780d563d2376cb6a507bc9e8
font_02_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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