Malicious PDF — malware analysis report

Static analysis result for SHA-256 913e33a2e63f63b8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-29 08:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e1e774169bb299ec7ed81349021d69f SHA-1: 04d2374961f0991f64effcc9666d35d4857cc96b SHA-256: 913e33a2e63f63b89678bee3d52ceff30dbe2167f0f24f877bb526cf99d31d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous extracted URLs, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 https://medvor.ru/uplcv?utm_term=tipos+de+cadenas+de+suministro+pdf PDF link annotation
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614393b6c69f8---56584987829.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/rokak.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/segojozitixanefuwukafasel.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6a72e02c43a051791573eee66bd0ab19/19914367968.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/tofurozonata.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/lexepexukiwilibi.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/43422811620.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-13/20210913132635954286.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///pofanisurenejexin.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/13213849968.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/zokajedavovipeb.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zobazipejajumiduwur.pdfIn PDF document text
    • https://red-adlay.com/upload/files/87898082303.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/76898134226.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/muvezalog.pdfIn PDF document text
    • http://runo34.ru/attachments/file/galunesedagojaxarum.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/56938441706.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/dilubozasumusefatipeduka.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/takuxiredilabug.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403dba559e7---witufuwubibugolonikin.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/2693031769.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b5d4548b5---puparumuluvinowako.pdfIn PDF document text
    • https://baptistfriends.org/media/vutotikapumewoguzinamuwu.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/wanugotagikupuwixez.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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 17280 bytes
SHA-256: b7a39a27a3f5437d5934fce749672e761a0a816536d66a7f70769d47bb67a0f3
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10796 bytes
SHA-256: ff9a94124b5b81cb41f353483e208c8e027473a63f002f213dabde1bd8301ac5

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