Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f835c35fabc509b…

MALICIOUS

PDF

81.2 KB Created: 2021-08-25 02:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 66a1ce54fcc78cf8910403bccbb9d3a6 SHA-1: d17326ae31e2c988ecbea3169c077b770630b267 SHA-256: 1f835c35fabc509b881621bf40decbdd63820c94338d4dcf9f10f7e367a9ebd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a phishing or redirection attack.

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://rajaunited.com/contents//files/donujexe.pdf In PDF document text
    • http://abwvictory.com/uploads/files/46971108110.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/73846922229.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/jogupagojalot.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/kaxiwemoremidisopari.pdfIn PDF document text
    • http://cloverdiamond.com/file/wupikagages.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lilalapavuwaxego.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/sokagewutaturapubu.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/povopozezeweru.pdfIn PDF document text
    • https://festacontinua.it/public/file/rusarisebemi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/075f0520ed86f37be87d7a375c56851d/jusomoxotowoxu.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/40752447138.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/seu3ogu4qaoj6t8d181hluvuiv/ziwovifuzamukodokigamewur.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sarinokokuduj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e448bb460---87337506233.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/fijarebamup.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/zupozidelomedutegikapinar.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/nolajogijetarofupumab.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3197016f4---navejizojusipemov.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/mekegepojaxapixet.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/61635960482.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/99316253260.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/klaim923v6gjf1v6iji4ttsqs2/79415357174.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s1uin2t0fs958njrk1tfpbk8oe/33677356618.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938bc11ce0a---19160921881.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dorosakuvufokafaduve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=use+of+capacitor+in+ceiling+fanPDF 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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10664 bytes
SHA-256: 15cbddaff74de8ef478a9f84885f5626397c2a8f92f5d0068fb018aba18c0591
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 16184 bytes
SHA-256: c7309ffb4a540d4b701baa8fc25eb2f8812d2a7140f412bfe8a3a76aad0dd5a9

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