Malicious PDF — malware analysis report

Static analysis result for SHA-256 691927dc1aa0ed5e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 07:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 885d88c0fc72be4e747439a2ce6c74aa SHA-1: 0b0d1b7534694c2f67c0238ee6e137092d504cc3 SHA-256: 691927dc1aa0ed5ea24876f23f6b0841c5f498582e6300283050b73b44f43417
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=mechanical+vibrations+rao+solution+manual PDF link annotation
    • http://oroblupiscine.it/userfiles/files/damez.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fac4d3267---kavebu.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/38812927835.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/koxeduzo.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/pasot.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/vafov.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/92552312567.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/simifasore.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109060911364521.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/785cbd4380fde19df59f891cb90c7a0c/jalazub.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144267813f12---1886750751.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/77223278494.pdfIn PDF document text
    • https://olajpark.hu/files/files/97443656576.pdfIn PDF document text
    • http://alltechsro.cz/files/totiketemerodufoj.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/mefejuwixelej.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/21966851047.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/75402772035.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/pajorojixovinunatetitiso.pdfIn PDF document text
    • https://baptistfriends.org/media/zimozobitefepejosusojo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vowater.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613610872c0a2---vitidezuxeduluzowojaforun.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jowobapoto.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zutufanufuvutapaji.pdfIn PDF document text
    • http://lecostationery.com/files/file/somutosipakezi.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_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10796 bytes
SHA-256: ce5bd98721d28e4cd2beb7fc1dbd663fc4f2eef68c4372f1269c377cd263c832
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 20908 bytes
SHA-256: 596d3319fb3aa74fe7ec494ce9a756dda099d3a8b427c1d9dbe31711ed92daf8

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