Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c8845622a4ddce…

MALICIOUS

PDF

74.1 KB Created: 2021-10-07 21:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cedfa4a7648f4fdba5374a1e21951038 SHA-1: a76ee2b0f22bd0b7369ba5d371c6d58a400682aa SHA-256: 40c8845622a4ddce80bbf789b856bf4db67d53e2344e8436bf9abb2d06274f68
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many embedded URLs pointing to various domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates that these links are on disposable hosting and likely serve to manipulate search engine results or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ecohost.ru/pics/images/file/bojozumunarewajaza.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158c6be07192---ketogaxuveginagizup.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109151205034872.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/86557220956.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/durovade.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jewelivowikaxasoxud.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/22628493177.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nigifufexujafazevisime.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jodafuduxewedav.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wufifod.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/civp4ffuhkudnr9mpv5cuvaq2r/7648909192.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/84700509296.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/74607342208.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/lodufokatisofejenilik.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/deruvofakofazolotu.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/8136090545.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/efe6d283fa683c6ae6dfcd39537e7e22/mozelowubikanuwipogadora.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/40209080981.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc7af0b7a---95353364931.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d699fc3fe7---89855653072.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/pirexisa.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/10328681898.pdfIn PDF document text
    • http://scro.ru/pic/file/mevikururuwonomezi.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/68445423025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=material+science+by+op+khanna+pdfPDF 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_off0000bf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF42 11056 bytes
SHA-256: 1e47f778716b03629dd7962f95bc421517c62212f39ba988ceb6fba7a018b285
font_01_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 16372 bytes
SHA-256: 7b534b8f561935b0b1c81ec4e52b95fe4b611a5e3c7af58a2eacb69f469dfb10