Malicious PDF — malware analysis report

Static analysis result for SHA-256 539020e8dc3dd580…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 02:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fc47b6ac8ba432d9100be55a780dd2a SHA-1: e7242f2e33d5e44998ea5b9fc2441785ddde5c56 SHA-256: 539020e8dc3dd5808786410c6465eaa0fbea634b00ada6ade6ac3a32ef1b50c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irvine.songhakbbq.com/uploads/files/juwibomagilefifozibuzebip.pdf In PDF document text
    • https://travelsafeway.com/userfiles/file/lujolakaredewobitivubigig.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/59459785196.pdfIn PDF document text
    • http://skupka23.ru/upload/m/mixobazuwabegusojumedur.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qoqk85tti96qgjs4ecdq3vec7/vuwirixajis.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/99f61bacc810319172da3b3fb043f235/29442685098.pdfIn PDF document text
    • http://pi-consulting.ch/download/mojinoxo.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/98571511305.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/fipaked.pdfIn PDF document text
    • https://webaprint.be/img/file/disusaruko.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/refatisudikejozed.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/rugoxuwewezurani.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/lejezinetapilalew.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/95105716792.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/jizisudotulanomiwigoge.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/47921631628.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/72939765903.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/semibupakenirokabenowi.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/29864542014.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/womepuditajotugiwidot.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380bc21b311---14356990307.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d072cb5fffc0a344a47b4dfc492a41a8/90116391226.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/wimikikatowufenip.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/35935774960.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/pezefexokuruli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=restore+backed+up+text+messages+androidPDF 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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 11292 bytes
SHA-256: 80ad8e47f907dff249c32880d5d32b128ab14befa0d448a72b8d27ca4eec833e
font_02_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 17544 bytes
SHA-256: 53778f0441bf5ef9dcce46f42e2378d157899904802fcf9fe3650a3e87d66b45