Malicious PDF — malware analysis report

Static analysis result for SHA-256 4839b45104c44cf4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 08:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a650258ece9e5626ba094d7d3c0ff9c SHA-1: 40fa4a1d50b6f4344a170ab6e01eafec903f0427 SHA-256: 4839b45104c44cf499addb647c77f2283be602a151b014c7f7d003f5597f6294
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=kamasutra+book+summary+with+pictures+kannada PDF link annotation
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/eppln9k0qcuums3utghp9sfgah/58781100950.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/35776836306.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/340360835.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/90292993032.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mj00vneihuv2g1e7515d0gf5ug/jutorokugigafenologapura.pdfIn PDF document text
    • https://purefeeling8.com/data/file/62485267542.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/28492300277.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/rofevenamu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/diwosepevixeredaju.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/jadomizuzez.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/42451808724.pdfIn PDF document text
    • http://www.pvvc.cz/files/jeselugipurixufuxogujamu.pdfIn PDF document text
    • http://normel.org/files/upload/file/sirututinedirebeze.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/zurasatewuxitub.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/71426214639.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3f32b395---sewiluxujutigujik.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/towatijofi.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/venovodokofakunozosej.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b618af11d4---mekelefovulopilovusove.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/23406698216.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71012622988.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/nesovujegosobebugimakafaw.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/dumire.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8e9ec77d---vododozatizetem.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/42157463012.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/jiwesag.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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 17984 bytes
SHA-256: 154ca688aa2dd83dd29cb991f66de14901af1380d73e7a51091a0f53f0cd2097
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 11256 bytes
SHA-256: b8908fb0a6a9ea072203f9a65c05b9344aef40d93c9104f8e7974a44c8657ab4

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