Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92124f1858426cd…

MALICIOUS

PDF

152.3 KB Created: 2021-07-22 17:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f68505c7d7da264f5dfe07a7b50d966 SHA-1: 8bb0ae36ed482499dcaf83f3692a91581c6f21c0 SHA-256: a92124f1858426cd31af56b82b2e307b1fc9e0cf95bca054e770b51d4479b196
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ligneus.hu/upload/file/pubujesalomikevedobukabum.pdf In PDF document text
    • http://dataction.org/demo/dataction/media/93536016871.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f34bd7eaf58cf234f0276a79486ff252/vaxufezukugesodonupe.pdfIn PDF document text
    • https://businesslife.com/content/file/zurod.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/24c9ce594e1bf9577f6db43c71bc051e/boxunaxowaluzoraso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744bdead88e---bilejusonivasoxexowuw.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/7320657397.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/75963658505.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/83722759623.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2402156f5---bederemitozopebuv.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/36345953617.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/gozexirusad.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/87387f7ab5f4b6079c67f65c318199ca/jobaguxesolefalijor.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/18683569539.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/78127350424.pdfIn PDF document text
    • https://bdata.vn/upload/files/66744776223.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/6074093227.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/kekepegipasevufegatim.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062008304492.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/warone.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19381f9d9---judogonozewusaj.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/bufaxijunoseduzigadezev.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/79475521480.pdfIn PDF document text
    • http://editionsitaliques.com/userfiles/file/5205672993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ark+survival+evolved+crossbow+idPDF 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_off0001f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C45 10624 bytes
SHA-256: e93cf7228b22a3503eff02db4f811c2768eef6c2c06ad3817a0a4d74877fe298
font_02_sfnt_off000224ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224BA 17536 bytes
SHA-256: b8af7032c7e2688cd50a9cd720fbe850671dbf42312b97a47eb331c39281f988