Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2da3a893561373…

MALICIOUS

PDF

86.7 KB Created: 2021-07-29 18:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac73cccb653ae5f173ee38585fa2f668 SHA-1: f611d00fa386b79e0714a093670b8799f666be42 SHA-256: ce2da3a89356137345640f9fa9985d67479f3ce555c2564ca057d53b0833565f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the structure aligns with a common tactic of using compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6amh1n2665n752br7feb026bf0/14062740886.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160763f167e7c3---nafote.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/37899605299.pdfIn PDF document text
    • http://dgjst.com/upfile/file/37941116092.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/35932456117.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/nubapivadepuvig.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/46dc984fe302367acdbd6c96cc1b8244/17747857495.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae1c021da---lilapawusulotixijejonewan.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/465c73cad23ad0f870fb2330496a34cc/21194635548.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/74174585382.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/lejovanawesikugopip.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/11375612463.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/rajomofafaxunog.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/jalitotifezi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d2617690---kesudupafoforaliwiwakotir.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/bunomazulokobekabo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d9f8d7f7ad41051ab57ec92287e4102e/68976192658.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/vaxukigezu.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/8553408021.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/32024553090.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/76688718065.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/solidinufuboremo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53606461136.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/77241522646.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66d2beaa63---dututirulojapipob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%D0%BA%D0%B0%D0%BA+%D0%BE%D0%B1%D0%BD%D0%BE%D0%B2%D0%B8%D1%82%D1%8C+%D0%B2%D0%B8%D0%BD%D0%B4%D0%BE%D0%B2%D1%81+7+%D0%B4%D0%BE+10+%D0%BF%D0%B8%D1%80%D0%B0%D1%82%D0%BA%D0%B0PDF 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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 21140 bytes
SHA-256: ceac308349e04cc1ed7dd41d5d35d67a5504b48d423d44896bfb1d56398f1a3b
font_02_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 10796 bytes
SHA-256: 36bd7de2afd5c44ddce1127c7b18be9eb7c77cfe4f656033d5b46b2f556e2a88

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