Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66c7bb6ec2ac3a9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 17:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d1ef198238996ff940d83d49c052d6f SHA-1: dca2443f1632eec7930ba83f1ee09a587a3d9249 SHA-256: d66c7bb6ec2ac3a916679bf318555cc119591b0216a76fee87fd28945a77d71a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many of which are part of link farms hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The presence of 'utm_term' parameters suggests tracking of user clicks, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=future+hacked+client PDF link annotation
    • http://ghefoot.com/fckeditor_userfiles/file/43371406749.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/74405881430.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4a39597b---sorafejukarivukafu.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/72016069018.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/zogubozilavebududud.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/55821741616.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060315314373.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/96277587029.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xebarunefezodisetoziru.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/69380985417.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/bosajuvawikomevom.pdfIn PDF document text
    • http://ombs.ru/uploads/files/76613642222.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/nijudu.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/zobobidalaxixetolukix.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31454563372.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zamugenunefaroxokajuwod.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/rulin.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/40016121782.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7a5e2945---wurotema.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/40272922450.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/15584550844.pdfIn PDF document text
    • https://campermagazine.tv/public/file/92280186433.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/tijonemediwisoleru.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/bigob.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/be9af5b3833760f85db3951a29bcce1e/95306998369.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/30903f800816ef97e545d490cc4d449d.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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 10348 bytes
SHA-256: eb2feea9268c282468c20ac0e71a06cff409e2cac1d294fd543e890c2d864dff
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 17612 bytes
SHA-256: f37daf243c6d38a6a6c94398a10460bdd69d27cdfd0f1b96738590bc92f3d1da
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1