Malicious PDF — malware analysis report

Static analysis result for SHA-256 b528721537b87f0c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 10:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7547dc4233ecc1fc81702150d7e2379 SHA-1: fbbde277bc96705d8c127e38d788bfde7ae1f95c SHA-256: b528721537b87f0c91f263727daed5d32202bcfd45fba2aab250790c04e8d096
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of external URI heuristics further supports this, as the document attempts to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.petercar0937494634.com/upload/img/files/24287990107.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c0a12402c56ab29d6bd46b053df5d2d4/94705410296.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5f326bbab913e0731da605bac81b44db/natokajiroduvifo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/8558356895.pdfIn PDF document text
    • http://northcity.rs/slike/files/fezaludufasivofin.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/81529939557.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/88cd1160b4a70c81e5af344401da4bd0/bixelukemapi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/jujozorelewironotul.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/gudumeb.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/cd0noj3q061bjh2j9r6ik5o4qg/58195562072.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q6s8recs53dt1ojvam9ict5kmu/80693080913.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/83691640633.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/23287821582.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70a21663b---23636268555.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/zoramulupelokatarur.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/78019a9aacb94d54a20f8f84f4cb4431/41835293383.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612944e51faea---79555831759.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/92452697030.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/tuvazexazupen.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/63787550754.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704dbcbd059---dolupenijatenege.pdfIn PDF document text
    • http://saptpadi.com/files/file/nijijunew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=5+tibetan+rites+pdfPDF 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 17628 bytes
SHA-256: cf4eb6a3f28ceb1733e6065b50ca2c631e44e8b12f09f89bdfaa0c11727287c5
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 10504 bytes
SHA-256: 6bc22490a5645271ec1321568f22ee3c4717640099ee309a5f8ac74ee5be8f4b
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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