Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef13cc30c2bb532b…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 13:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 18103b92761bed40e553b5437cb86f57 SHA-1: d89769c472c9dcb8494d61ef0b2aee10bf581684 SHA-256: ef13cc30c2bb532bb45d76a657abcd662a808220f49827c56d26f071109f1942
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous embedded URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of external links strongly implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nvsmmcrbsl2jtrfb586ombn66a/pisodeguziwovebaze.pdf In PDF document text
    • http://szentistvanpatika.hu/upload/file/ruruwupoter.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s20f45fhldeb87lkichg4qu96p/32104053071.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gidazelafapoletoguxobuxa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085cca188d63---90194227690.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/14660850625.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wosuv.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47ef5ea032---sozol.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4a99a612915ed6c8f6cb7ef823cdb5d3/78334399393.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/21647816801.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/7103640281.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3fe9f1df5ef261a7dbbf21b5127c43d4/69668397991.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/34215021310.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/61803272643.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/gomujixirigovixijuvamob.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/zokowevomevilena.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/zilunabatono.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/9052588171.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/domigo.pdfPDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1ccc449f0dbf242083d18aed59d47fad/77855944579.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d317c5a70ba---53486593498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=freckles+on+cheeksPDF 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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 17176 bytes
SHA-256: fe645215d2b58e5078af749fd0351be907675e0ec849fa8de11a0a45cf8d9aa6
font_02_sfnt_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 10044 bytes
SHA-256: e15af2674c5b69b88fc3b3080d2ee23187c41195f689ba489729261462b8705e

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