Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad2e75839ba739f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 01:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c648b488b7e2306e3a41a10c762cbadb SHA-1: 34aef4461111d0472fdadf5ab92fe6f462861e51 SHA-256: bad2e75839ba739f5a380a5c8129dc1b9e27243f21ff3bc6e88bc2e8d527594d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to what appear to be compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=inssider+app+for+android PDF link annotation
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekinopuv.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/16337750083.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0543e81c3e63471ccb388bc4bad91e5d/sewuxotekim.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/wotekoxe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/966c3f5ca9f99754d50a917af40c1aee/ketaboluvogowobe.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93856971370.pdfIn PDF document text
    • https://aayams.com/userfiles/file/jozurivinuko.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/tawemejalujaxoxokebizoxap.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/65388565127.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/bowatorobepunejinu.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/38518346380.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4a222b159bf93dff5ab74ddfc950f309/zeraguf.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/juduxujuvonubopi.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/1647066412.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-7/20210907191407487531.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wumuxekevutinipigajigogo.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/fexifig.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/99809384570.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109100559007785.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/14763695036.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/losokanaludul.pdfIn PDF document text
    • http://homeopathyhk.com/files/kegalegekezupi.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/mosotepane.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_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 10296 bytes
SHA-256: ca1063c063628207a2119597ee6d10d4f32bebed992e9bd30ad3f488cb66aa76