Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd6112829d19ade…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 13:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0ebb1df16b66f804c1f76768134f9ec SHA-1: 869e681c9b4d731386cae89c406f18d1b23c36d5 SHA-256: 5bd6112829d19ade7e9d8f354e0741a7b3650d5cf96ecf1ab6c894856186dc41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including those pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=dadi+primeshots+watch+online PDF link annotation
    • http://kleinschadenexpert.com/userfiles/file/vefatijitedumuxunurodonix.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/jozufefesisukonafasajoti.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/tonodebizad.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wajalu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a2a1fbc4---xifelebugubujexuze.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/009144ca88feb86a8686851cbb9d5647/9256231328.pdfIn PDF document text
    • http://czyxchem.com/upload/files/zinanigobonugazopi.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/5358070554.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/niwerajokejozanifesatutoz.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/76772181748.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zeberusumufipirurolesizi.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/genarikopukagekigowak.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/buvirexuzivukobaseropesas.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xukabot.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9aibtvabcmmugco4hmg6so90v/30579730760.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/ponekewoludekavutoke.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/47446786221.pdfIn PDF document text
    • http://land89.com/ckupload/files/95706292627.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/34525124679.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/bakixeginesubudutisefir.pdfIn PDF document text
    • http://eva.am/files/65f0527a5461a977.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/5560894002.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/60651692336.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/mipajakigob.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354722512e---nomujisedovotib.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/zenamozalavaw.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 10868 bytes
SHA-256: 1b95f9daaf7a988d6f6eada4780386750d1e4396db37333d8afae789cecdd960
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 18168 bytes
SHA-256: f85714cc67cd23707fe95a05c1a0934082eb32194f79f7f8b95aa564d234dcba
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1