Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aab36592c9cba3…

MALICIOUS

PDF

90.8 KB Created: 2021-07-25 00:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5b393705fae9b2588535ffce278540e5 SHA-1: 92e93403df82b0c4f8c381b042596c75f0c958eb SHA-256: c5aab36592c9cba3ea15e356269ee427b7c2e997fd83d5788922d807031b0c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ixtvs.de/_upload_bilder/_filemanager/file/jiripoxuxove.pdf In PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3a9a2a22---48472502630.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f2362610c1c---93947974316.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/lekij.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/bisobivutubotajudubilo.pdfIn PDF document text
    • https://tdfstore.it/file/44324388275.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/90043383076.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/buduvago.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/53315405111.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/37193690468.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/popofivivitejorutuj.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/fesorojetozoxasum.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/kavemodusukisudipulegesi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffa682934---midovabuw.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866852e997---1874114849.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/bobusotininuletunoviluw.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc103efc5b---53112503659.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b4825b720721538f79a9e24c7f48c14f/lufuxipovabuge.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b6f4e40dd1820e6419d8c94efa478236/29719945531.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1c49026e---lekidutevotudel.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/92996191348.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29908636ad---gogilogekaxaj.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/kalomapinuxuxizuxakifen.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/f7j2am3at1kplo4v037ktaq8se/tegapakidugupilavuwepuwon.pdfIn PDF document text
    • https://andrejc.si/files/file/26801322129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=is+vertigo+symptom+of+covidPDF 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_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10780 bytes
SHA-256: e50f4d4ceaf71159e268a1915ab7631d6f92c41797b1356fccde58a9c1badc22
font_01_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 16668 bytes
SHA-256: 5616ee043350761a70958fcb9fca0eb5001d19226f37b041bcdd8223b9a2d486

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