Malicious PDF — malware analysis report

Static analysis result for SHA-256 a382c69bec6538f8…

MALICIOUS

PDF

87.4 KB Created: 2021-09-14 22:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46fc974f67a9b7cd0cabf2c9515f8467 SHA-1: 561f714b60b54633cd5858145331b22f3bff49c9 SHA-256: a382c69bec6538f86903f4f5935d704c4e5ea50db9b5e693f2b162d9ae12a6e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of multiple external URIs and a link farm on disposable hosting suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=snapchat+loop+video+android PDF link annotation
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2157b4aaae65bac630e4f4555e0c86ce/68541317783.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/66505902654.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/659732075.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nubupadagotozunuluxobawuv.pdfIn PDF document text
    • https://thepainter.asia/upload/files/jesokuwivu.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jarowidaf.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1b6c801e9358769242d60998c48c4fe7/buwagi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/25751873652.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/46731622054.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/lerotakivonaz.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xovovenabuxadipa.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/1552846414.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/mimavat.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/21393328145.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/57796993644.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ad45cd00---18162087569.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/zinipevavavanawugoxabalek.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/70995466942.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/wezepedimemovizas.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xisimamopik.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/46461266800.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/vopefugilipusiregapuwo.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/82840718341.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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10584 bytes
SHA-256: d8d8b9e214ee4be9bd17a307b5915ebd723dbcd9b3e46b6b3bd3a1f0a7cec01f
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 18456 bytes
SHA-256: fdcd66a21d1ea2b3bd07b1768057f9586d9fcbf237d610bd3d84460710202044