Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c375a8061a0207…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 05:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef084e8caac42001ad8bb7ef40db8a30 SHA-1: 9c2f02016b2ff2ef6ddc75375d560d27b0b01529 SHA-256: e7c375a8061a02078d6826c42ffc99c460458cfdd0c180064233b6b78b0a6091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded links suggest an attempt to direct users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://markone-tools.com/upload/files/zazuj.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e3207671---zugupubevibuk.pdfIn PDF document text
    • https://led7.ru/file/27270525054.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zitomogixufewosazagipim.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/69578903760.pdfIn PDF document text
    • https://parc-hotel.info/file/futebefewelazenepevitam.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/rowegimosekewob.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/zepafumi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9828abfe---vabov.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/fokigetegupetafobe.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/pajugokojetusesodubinegav.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/95610620910.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/tikuzurenekapuzu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109020206253010.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210912_999EF937FFA8B006.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/40062109904.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/daxafunukulorese.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/54522137087.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/joj7ov43seoo2ifm9lnl9f1nl1/33203522612.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/96683099427.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c38feefc2---zazubadeto.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/21716058359.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/42769580935.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd5438dcec---61683539262.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/dujok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=2+bit+binary+counter+using+d+flip+flopPDF 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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 14672 bytes
SHA-256: f15bb64e470d9c032dc255a185a8db8be84b9cbba5a04eecd14ea10304e5c619
font_02_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 11172 bytes
SHA-256: 4d54256b7f78360106ad4b8c223d788064d2cba0f981d64af23a5f34334ff58c