Malicious PDF — malware analysis report

Static analysis result for SHA-256 528d85fe9d05fe7a…

MALICIOUS

PDF

88.4 KB Created: 2021-08-01 08:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6069a9121ae09b49ddd74622c307b388 SHA-1: 8f0985c901627c4c3aac359bec81d97934f36576 SHA-256: 528d85fe9d05fe7a8b52153183dd7906812e8aa099510028d2fda44e4d974a67
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous URLs, many hosted on compromised CMS uploads or disposable domains, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://mxagproducts.com/upload/browse/file/wapofona.pdf In PDF document text
    • https://gotoko.com/cmsv2/upload/files/7755609389.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be54b5726ef---mikogo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb4776b90---gejelofozibag.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/vuzutogap.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/37213147530.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6a5a3f57---48017247200.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/47386978863.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/belotisolore.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/woruburudoki.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1e6c0c53f875954748be4f27bc6b7414/15987936250.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/11596797391.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/fizelovosatabefusi.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/85962167983.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/97364155818.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/4995323470.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gj9ch5hgb8i5q3it7u0lt561c4/33469525913.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p1nfcelo0r3p3bo0e29ahcf81k/11165913258.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/37033277110.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3m2tes299d74a7a7pvs8otpq6/26819063410.pdfIn PDF document text
    • http://safarang.com/basefile/files/54006414875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cuales+son+las+medidas+oficiales+de+la+cancha+de+voleibolPDF 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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 17252 bytes
SHA-256: 60b75f0e0fbd8316abec1bf1cfc539bb578b331486a596627c78cf4d741aa2d3
font_01_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 10880 bytes
SHA-256: 291c44dc77de3cb558a2470166dbe3c76eb0e64c442277002b5bd9c011c44323
font_02_sfnt_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1