Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49b015881e06032…

MALICIOUS

PDF

76.0 KB Created: 2021-08-16 13:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14fdf8f8b866fc6806f66ebcb8944615 SHA-1: 2328964d2f1835cf6d9f84a2761a7f09d47acbc7 SHA-256: b49b015881e06032d4e53151405b7cac9f9b02137ab4f513825c5952a6f91b17
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of multiple compromised WordPress upload URLs suggests a pattern of using vulnerable CMS instances for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=multiplos+de+2+y+3+a+la+vez+comprendidos+entre+90+y+150 PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f95eeb874bba39ad347740c5d735ac02/deposez.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e6a7e8cba277c5820556480a6ee5c3d7/liputuv.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/warumi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/806d50bada3f78724fd2bdd9abe133fe/tisemiriwidipalobuwapi.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215182155308828.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4g6k85d17msi69mu8kl8s0o0hm/13122619126.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c72ed3f4168---43142314213.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/19681658500.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/37022700417.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xezobozaviwekunejegak.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/sufovesiderotasofibekiwo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/844568d1b3d72c5d54b37ab1f17c036f/zizazado.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kikegowazanewalejup.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/7185166908.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/26979889233.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/66588680316.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/govegagomam.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44516579386.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qfpracu0caqap6gd0rlnd31jp8/jadumuwob.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/30590284975.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/jotugulovarok.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tefinumoleg.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/19042876728.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/i1kfeo06jembh695l28ocfubtv/70814124852.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/45425533618.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_off0000c21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21B 16020 bytes
SHA-256: 0f54a5e3c350f928696edc20531da7f39f685134ecd604b7672837457f098013
font_01_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 11776 bytes
SHA-256: a2809ab5e6452cf09cfcfe6bad9068d17583c41aa05304723332aece9203cdf3
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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