Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8789a0fc2953a5…

MALICIOUS

PDF

84.4 KB Created: 2021-07-16 03:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5dd885870c41370d4ef4ec2eaa0ab5e4 SHA-1: 9f9e266a05538f32f87e04fc6c50d80ec7a742cf SHA-256: 5c8789a0fc2953a51b82eade2bdbd448bfa7fe374cd51d9cc5be5c6bab4285fb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd26e7b49---nudokijufisawibonusibiro.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865711e549c---81647212998.pdfIn PDF document text
    • https://ecoretras.com/file/76786370772.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e723935a---40242739072.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rciskjfskq7b1njlno64l3b19g/buwopelatige.pdfIn PDF document text
    • https://room12shio4.com/contents//files/35030570652.pdfIn PDF document text
    • http://alcantara.cz/data/file/wavokagudubisu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f4b7a80a61ec0dadfaa29de032d941cd/31790023439.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ff7a003a54740b4cf950b5ee54b945a6/71252658041.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4f70eda31485461e5c3321b24dc2fc16/sexasetiduvafojexuzu.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/28254237990.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2b21bba030344ba7c3b206eedc7c40ba/rulegebusolep.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32a4366a258f0f650dc80715f3e01cc8/10088650210.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ahbs5731g8qg50msa0gjrgimr3/jufozisadevup.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/gdugb6as71op1t8i7f2chvl6j7/pufojutenefisuj.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc773719b---biwukarefiroju.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/roxuwasamipakegi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3a91cccec7d5e112fe1bc243093aaf01/tagig.pdfIn PDF document text
    • https://digireg.sk/upload/kizefa.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/91964267794.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1f6fdf0cf0e6ac5643db2617cc1d4d12/wejimabogokewaviwuruz.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/xukelulikatadexepogela.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/kuvod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=humeral+head+fracture+treatmentPDF 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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 10452 bytes
SHA-256: 13e9a7e7806aeb42a33f382995823bbdcd0844123e99f62cef8386d6bd3fca73
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 17052 bytes
SHA-256: 5208a1d597983372ed73f67ace76a593f6ca51f6dff78a59d8c27e389db883d8

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