Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6e0ec2f35e2363…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 07:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 827b4a422a2e7b8bbfa8482e4e96aad4 SHA-1: 911852b2019728f0129950d49f06c8c06b078da4 SHA-256: 6a6e0ec2f35e2363cda9adcfdebaa76d622d14e4d4b903fd66a287a1f293bed1
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites hosted on disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609045963ca35---91758063929.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/150f3121c4597573d22d48c8da3aa957/55760494889.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082644ba2854---xuboxiguz.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/wosiraradunekeroto.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/47974502167.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20e4c8631eb33020f3cdea0431d90b0/87683157218.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210613_53D4F652EC9ED286.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/zikurinovekeroxowe.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/90c9d483c05b7c376aa9672f1d4e2d11/79570810569.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/jarefinofut.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/69780640784.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ffd05979eedfcd009bb65e90f3e70d5b/44341163270.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zabetukotinabimafafejinu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3c60bkkr8usghou5e6fdalrhh/xidanel.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sujilelebopiparemafabobo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210528/file/83044391219.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160baeadd68b44---85260234842.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/lbh157r036t5sfo50ehcrm0o5f/sifepugezedije.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e4f4bc16---91373565236.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210612071452.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9a37d661dd675fa334a4653f8420e347/47855719802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=data+mining+multiple+choice+questions+and+answers+pdfPDF link annotation
    • 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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 11400 bytes
SHA-256: 0225eaef91f05fac3e425196010311b33f8f9d5ad2b14f4e1c53acbc440ee20d
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 17996 bytes
SHA-256: fa59bbae438691bf073dba76b46b3ed1bbef331ecf91e5b28ef73eea68a4497f

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