Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b976f1ffc7a8ac…

MALICIOUS

PDF

86.7 KB Created: 2021-08-19 14:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b96311fa1e8d2fa742635869257a5c9 SHA-1: c3f64b1c86fb206110c88712cc4b863409c12461 SHA-256: 36b976f1ffc7a8ac72e366f13b3481a7c1c64e2c1586d5a238c9a5b34c93faa4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on what appear to be compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nulifeus.com/~nulife/userfiles/file/14389763213.pdf In PDF document text
    • http://harasim.cz/uploaded/files/70499229557.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/miled.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607563ad1dc91---fozemiweruwixi.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/melebeduzufamatoj.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/77184916573.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/99048951470.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hqsd8am2fh32jnehbop359rndo/jepekakabilebabalokasaf.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/71990317252.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ks2ae4gpitk6nltcebnjvjh8lf/mapivitakonanu.pdfIn PDF document text
    • http://kesifveotesi.com/files/44592776959.pdfIn PDF document text
    • https://buka.ru/sadm_files/74128221978.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/162fcb4074eab2345b1342ed64878068/nomefupewawa.pdfIn PDF document text
    • https://protrialse.eu/files/files/61550174626.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/botaxafosonugiwebiwos.pdfIn PDF document text
    • http://alltechsro.cz/files/zanaputefusud.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/xurejajejapezeva.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/87874339186.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f3ff04c3---majajarufewuvoxasinud.pdfPDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e72c8042---zatap.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/varew.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/24601371420.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/6644576146.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baca8d38cf---87829826116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=right+triangle+trig+word+problems+worksheet+answer+keyPDF 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_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 11316 bytes
SHA-256: 168010b43c8dd19d28614b86734f2e5899b0d3b86d2db0e91f238b3b684d6d49
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 17644 bytes
SHA-256: b6010defced51318493da8444c9c5d2d08b84d56290496f1f56dd47d4044cfe2
font_02_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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