Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ec95197fea6a8…

MALICIOUS

PDF

95.9 KB Created: 2021-09-17 03:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df67eb35988af98e95aead44d8b0d18e SHA-1: fd04efd16f2512d18204685c5b6ca54252f5d0fc SHA-256: 5d8ec95197fea6a83678b0e99b1c773785c46112975fd9a94a196e928154da8f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites hosting further PDF files, suggesting a link farm or downloader infrastructure. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL findings strongly suggest it's designed to trick users into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=virumandi+full+movie+hd+1080p PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141de8678b64---74879240078.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ff00d305c2a55aee55cb02c6f8c64dc/fukoxe.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/momisawugaw.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210917_5B69F26B06F03D09.pdfIn PDF document text
    • http://zimmerei-possert.at/1294581874.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/35742540328.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/25470895687.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gekilexatanagas.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/72804725758.pdfIn PDF document text
    • http://dasbluemchen.com/vovadexerufezetipun.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/42951057698.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/fubetifarabukuxiser.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/diwomuwatoradopenosobazo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd4d6f37d---xabodedopikudomo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/412a673c4f86528aa5aed18e96af9fe4/50806265470.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/47690946715.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/butaf.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/23625262593.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/podofituzufomevuzasi.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/numitukutudilavinigopuxi.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/72998128449.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/linodekepa.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/52496919290.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_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 20812 bytes
SHA-256: c24521cef2d8be5840e214068161dcfdb83d54ee30fa09bbc39e77e27f91be44
font_01_sfnt_off00014054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001586b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586B 11016 bytes
SHA-256: f55af96e5871727f2b22d23296a8b58ce501b352b74a6df352307d7c20528801

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