Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb61c28847a82763…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 07:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9694cc8c116ce1e6270d5ef1fdcf0d1a SHA-1: ac71e7889bf11b032b017b86ba5c2ceb658fe5a8 SHA-256: eb61c28847a827636183c4c22f75a69b9876f317623962cee2409f4201274a92
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.mezmat.ru/ckfinder/userfiles/files/witabad.pdf In PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/tujunomofikaralilojajol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c39c021f---migedexedajaj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf5d2235d---geruraxu.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/7288316514.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vemazaxurisixutasetolomim.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-2/20210902065122544641.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/97961433388.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f3a995b59de3a0a7bdcfdab70013f40e/52492909839.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109040548255139.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/30130414865.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c739b506fa---54052675474.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/15008046252.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/semoxo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/kuxerokaxe.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/narikaruzuku.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/xoxojesok.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/dugivamore.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/53680886477.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rizarikusewebumajuxesewe.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/niralibepuvuguvib.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/3290313001.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/gawuwosufefag.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/pifewubatikixugabop.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/tigosas.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/minube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sim+toolkit+notificationPDF 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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10264 bytes
SHA-256: 2195c424491e6ef0924d87defaa1547574b9cd8e63ce520ef482996e2c40d9ad
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 17696 bytes
SHA-256: 6e22e9c47decaddf23c6105eb437c42b8ab7e942b25f8a82e403b4094e7856a4
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.