Malicious PDF — malware analysis report

Static analysis result for SHA-256 369f708e04bf25b6…

MALICIOUS

PDF

90.7 KB Created: 2021-08-07 09:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93bfb49dca4e3d98f8946fec8b4b0a97 SHA-1: d51935918a29e7d2872aeadb0d96172ad960b003 SHA-256: 369f708e04bf25b6718c6bfb115b1038de592e46b72c3f2a852f624f77c9dc90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm with multiple URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded JavaScript and link farm suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turnwealthy.com/ckfinder/userfiles/files/jutizox.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/87482716473.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3dec1d20f---84119496837.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95bfd7c41---kisirojuvuxowes.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ebdac3d57914ec000f0bad32740da28f/8273159356.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e75a46be122---lutemi.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/49252822765.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094339c1f5c4---vavujisidafuwiwago.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/766978f10289981855bc7ed1680c99f8/5821721926.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/mubekoranega.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210703_6E25AAC00D0560CE.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vesodoxinuboz.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/62089856451.pdfIn PDF document text
    • http://ipllaser.in/uploads/salizerap.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/n57hseggfhqklqrh18l58buqk3/23268030095.pdfIn PDF document text
    • https://camelcarpet.org/d/files/joxobujikelan.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fejikiboteminabixemad.pdfIn PDF document text
    • http://splogservice.ru/content/file/83008513451.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/47c27d554a72d4973be0477576c0e903/gotazizofegogamufube.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/xuzexisugeg.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/72cbaef6b63b16d218e9533fbae6665d/62844686195.pdfIn PDF document text
    • http://dentherapia.hu/files/file/pegulorirub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ejercicios+de+verbo+to+be+en+presente+pasado+y+futuroPDF 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_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 18688 bytes
SHA-256: b32e1d1af2b6419eb84092812ca46dd1008706f905fc6bcd29cd4e96269c9ad2
font_01_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 11100 bytes
SHA-256: 26d29f6f62e6e5d0777c2d8818960211af08aad9808de80de293210e9324461c