Malicious PDF — malware analysis report

Static analysis result for SHA-256 5133018bbb591e8e…

MALICIOUS

PDF

113.4 KB Created: 2021-09-04 12:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66b90107f2af0e1802eab60fc4585609 SHA-1: 271ceefabdf30f71b78a7b2ec75cba19525d97f6 SHA-256: 5133018bbb591e8e04297c06f512ada7becfdc6fd919387e5b78c5266fd3aaf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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=river+flows+in+you+guitar+tabs+pdf PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608802c01d978---kugosoxitifem.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/180149551039.pdfIn PDF document text
    • https://ivanamihic.com//files/70084355437.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/fc0479693a00cbd18883a8e3f6038fb8/84757969108.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/70904367117.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e48fef292---mepujeri.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/86981480926.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/70870393435.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7100e3e6b---goxogotitelunelak.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/voruko.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/35644282755.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160799244d406f---zuximekurukorojosira.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b32445b5ce---guzowopexijozewovonamowex.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b80f68c02---wemotujubow.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65eb6bdeae---fisezekibuvumetemolediv.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8142274ebf---satarefudupumibos.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/10080334171.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b87d44c06---83923827025.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/48f017c626b01d81a3c8a03d1cba6d09/86389958820.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2592b917---584466121.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/4775038268.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/tusibowuwazitojeguwineb.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a3f1b0521---nigosapasofosi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722fd554b85---raxip.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/82074841523.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_off0001544b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C62 11224 bytes
SHA-256: 3f71dfdb4a43dd2218102bdf0293506292a2703bc154ac629cf6e893719313fa
font_02_sfnt_off00018676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18676 18908 bytes
SHA-256: c7228a3141acc2793ebfe2e81436f039b4ec81d8a5d352a51343f9a88cf813c6

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