Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b071d8e3edf3987…

MALICIOUS

PDF

100.7 KB Created: 2021-09-04 03:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f4cd8a29d967770cd7ef3c93197ace1 SHA-1: 4591448a1693129b042e7299c8569fd07078588b SHA-256: 0b071d8e3edf3987e554bbd1842a083d10d8311e9e58cfab200d301335853924
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=convention+solas+2016+pdf+en+fran%C3%A7ais PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/78f4c03ef3c7609382b4dd6e3b058286/25709625616.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gigoforizonumulise.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/figowobemofezulekipezufa.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/39935496570.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/menusapigitosebudavubepum.pdfIn PDF document text
    • http://gewald.ru/content/Files/vawakonatetekivegi.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/vixupaginuti.pdfIn PDF document text
    • http://uco-kampen.com/media/files/32084871421.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/77usho3fhngkllg4a3h6vne159/28720607156.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/matedinazu.pdfIn PDF document text
    • http://askort.pl/Upload/file/74857202992.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/sijuxuberiluwirugujuraguf.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2b4051214---kedalijipe.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/38144228791.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/60809522725.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/kulepizakukupipirefipu.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/viresupepozixegow.pdfIn PDF document text
    • http://heizler.hu/files/file/rozafoziboguvogugon.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/bazufikujuwegotifojuni.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3g2tgstj6fcqq9at2tg8nkfmg4/48306680824.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vititorewowo.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_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 20648 bytes
SHA-256: b27ecc7cd2e7f8f42cf7118b663af0e89c72937b5d4f8c6bb78a6eeec5e84493
font_01_sfnt_off00015043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685A 11248 bytes
SHA-256: e376d7141c1b7161b014f0a7b62f01bc5d99cad021629f4cda52c074d2a275be