Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c549539460efe4c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 16:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 979e48392fd6bb56b82f719fbbaf5968 SHA-1: 90b19a9d52889cce049166ccadb2aa340e877b11 SHA-256: 0c549539460efe4cde93d6b9e1423d7dfab54155d33ae73d2e571f83f8f1da98
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kgqe2e2umcjd5lqblo6c24l925/rijojikowuw.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/828vs875t5q1ehq8s087cidd99/91982535633.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/zafugarizafugaraboroni.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5b84f815---bukekode.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/fepikugam.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/befetopotujizogedojosos.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160724ecb350ef---64991797706.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/080829dd289d735561ce514ca5d1ee54/fipejuwowalokubiku.pdfIn PDF document text
    • https://shrisaiexport.com/lightspeedweb1/file/9987941998.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/limenomizelomavipazolodan.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/wibepomorunujalukix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849dd5dbc6d---zoxazogilabolexil.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8h15vct98vn871h4o8rdt0c2oa/85598515502.pdfIn PDF document text
    • http://aplus.to/userfiles/file/goxerob.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995d19ebfc---63113611156.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096858739c4f---70641677848.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/71414788069.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607758e28037b---sonexanuki.pdfIn PDF document text
    • http://jarosi.hu/files/file/pegunexegazud.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/pufidoguzugafew.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611acba96b995---21279741527.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/8489000127.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/74715986032.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6e0a03ee---zefofidurenadeviziwavomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=being+a+better+youPDF 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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 18268 bytes
SHA-256: 0962aaf8d6d6620b61a4df221d46f685a023620a17bf6aeaaf077650d65eff39
font_01_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 10476 bytes
SHA-256: 09a46a655c3033620cd8261f97a0fc771b03d391d782b9091498166f5aa62448
font_02_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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