Malicious PDF — malware analysis report

Static analysis result for SHA-256 90577f7da98220d9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 17:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13d9150782f1e82ded48559672c042d7 SHA-1: e3a5770b5d347a481e8046f09698e023a2b4dbbb SHA-256: 90577f7da98220d9b2661d85d75707aaefe2d02e4fc194859248ea9218a4e603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using compromised infrastructure to host or link to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://teamwork-poetschke.com/ckfinder/userfiles/files/laxozo.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/zivoxubulilive.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/82783730496.pdfIn PDF document text
    • https://afayl.com/userfiles/file/sutizagevasisojanoteku.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608364091df1e---gedugiligulapod.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/55019489209.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/zakobeb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b224d127b8---lijusazaj.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/zekusir.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/89116048905.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/76b4d52f44b10ee1d210e44a48873ba2/85812911943.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/zunuxofutuvurawutigabej.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072435dad30c---vikerirelunefiw.pdfIn PDF document text
    • http://stonebreaker.at/bifajawimifepe.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/zixuzasuvarafoza.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/xizonu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/34391327233.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/losutatilosego.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/mulikabuwej.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/xujaramupag.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/338754506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=definition+of+conflict+management+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3f0f9f29f14a3fe71b1fc3eec607e67/22112418891.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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 17164 bytes
SHA-256: f2f2d54cc8c43622c989676a9fedaf49136802dd07690e5a761aaa52bfaee598
font_02_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 10696 bytes
SHA-256: 967d9224192c908d814d9d3d920a017480e6647aab9f151bf5b8627d0163ccf9

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