Malicious PDF — malware analysis report

Static analysis result for SHA-256 02175c1fb3b04e1a…

MALICIOUS

PDF

69.7 KB Created: 2021-10-08 15:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 057e0de7d9d5e764b07bafe2f427fc01 SHA-1: bcbe31183faa5e7a815f4eaffe350ca2e515d25a SHA-256: 02175c1fb3b04e1a2393ef1815516542c7d6a8180aff9ae32cc1db45cf4fbff6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting or compromised WordPress upload directories. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=apa+reference+page+example PDF link annotation
    • http://logisticsnetworks.net/ckfinder/userfiles/files/83590434050.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/bodujipodexuxexezewugen.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/mesira.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/lexexilaz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e82eaf075---sopabuxovikimupitiraj.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-2/20210902022204192107.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0n573cabh6trl0sss0ddfisrvu/novamulebevobulobelomowik.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c904eb2f35d7b00210bfbfeb02789cc/56457243003.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/towevezevofajosuxebe.pdfIn PDF document text
    • http://congluc.com/upload/files/65187671189.pdfIn PDF document text
    • http://benly-carson.com/product/files/ribitakolaxekatiko.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615ad869a85eb---lonatuje.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5de6cccc---13021069054.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/74304376641.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/49467755425.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/65649275313.pdfIn PDF document text
    • https://value.ae/userfiles/file/8238044907.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/nofupedudugufixinosale.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330d6a67ccd---satep.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/27661658020.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/nasanipenisa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8d7c5e11230235b42711f8a7d6fc4850/48444395799.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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 15736 bytes
SHA-256: ffe816511eb902db7ee535406c41518e2857df1d8dbe90e343810c51309b1eaa
font_01_sfnt_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 10428 bytes
SHA-256: 1e5e45f16d4e12747a52fade99e7c94b1095871fc3bad0e2b8814efab5f53572
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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