Malicious PDF — malware analysis report

Static analysis result for SHA-256 721bae3ce04b0f10…

MALICIOUS

PDF

92.1 KB Created: 2021-07-13 10:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e0aa5b98e1da46b9458cc9b54f08694 SHA-1: 30880f2a6ea6b908923d09dae42ba162ba8d0016 SHA-256: 721bae3ce04b0f10cacfbf507dde50b3fa31c7f33398b165aa782bd8547aff45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of link farms and compromised CMS uploads is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=coleslaw+with+red+wine+vinegar+and+mayo PDF link annotation
    • http://tsrmmessina.it/userfiles/files/27225625813.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/35312988539.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/kamadodopukonud.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lozetofib.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a061697d12---97021649334.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072d509e689d---tufuribaleli.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f852cb85a---jifeke.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a4a936612d3fdd9d61c73879dd904976/7765594718.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0aeieu49evdmb7su3ehptu4jf4/tokilatumabuxapoxug.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/kubil.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f773cc9595---bubegurevi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608648878285e---tugobugunafivulewibakub.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/edb47c3c25682eb15247e15758d5fc74/87582472559.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/62712b3d30cee755b54182056f726d04/jusepojixusakefa.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd22cc894c---pujemivevalozuwelabuxesof.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608614700100b---48059207982.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d80683c36989c25acad7bd3c87930357/12129681385.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb79cde492---ririliboxifegibipelarud.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1aed17c117daab8250ba39e77ebb95c5/77078829952.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c136bb1de4---81455876289.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/dc0c221e97f72b50dd488fa7ec46f497/vuxarugosagutewi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/16995310134.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/24960841002.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/16821631655.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_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 17984 bytes
SHA-256: 04f5f6af939c690e0e1c20a38dd13f78d1821da43b015288c9ad28a854287691
font_02_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001492d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492D 10992 bytes
SHA-256: 0b0e97ebeb54436500cbcb3c110f4e1b67dadfb5a099fe867b7d021d478c604b

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