Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad7e0efc795083b…

MALICIOUS

PDF

81.7 KB Created: 2021-06-26 04:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 113f0ca524996ef33422fd1cafdd2ed0 SHA-1: a3631902d04339ec3c256e3e1e3254a914a6b301 SHA-256: bad7e0efc795083b1d342ca91ff4026761e62770b7cde5673937aa42126d58a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=reverse+meaning+in+bengali PDF link annotation
    • http://domplus.su/userfiles/files/waguvadutuvup.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/25e2bc98a31882fac8578bc77741f7d8/gazapav.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af3bc3f7b---javagerosogeberatomedu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/6128600993.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/pigidawesafumin.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bebozabizijigarelexobex.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/954aa3f4a10470220716fda3b9c4febf/piripesuwalutikaxujepez.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lj78qm3rguv8mikkn25apm8v9c/gexukib.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/tavotelewenawabobil.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/2887607086.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c479e5d22e0---nijilirareperoraxeduno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54217956e---molipanolomexapezaton.pdfIn PDF document text
    • http://apvn.info/userfiles/file/65874065346.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/daxagefazusaritalalub.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e283ab1bfc93f90245a3baa732547e43/zeruzesirukokepabawi.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/dotusuz.pdfIn PDF document text
    • https://aashianarealty.com/file/70100940564.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ad916c4ef85270ea71b2391b4ff1c805/zotofamoketowofe.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/medapulelinugarobogedena.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/53a592c5e2f158c37915f77d4864304a/97834556250.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4cbd3b95---bapelar.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/82c3f2412c0b82a39004c956e4fb4edf/95624276166.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8rsug48ams229dms3fha3hepv/nujapobasikikulurokupuwa.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_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 20632 bytes
SHA-256: 70a8be90b45afe10604107a3e8c89556d7f7ff725c96728e2a27d7fafb52759e
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 10484 bytes
SHA-256: 79f0b0d04e5a2036fb4d4dbf48b917cc10f8670b024f0e108d3fc5e9d589f3af

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