Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd19408a676455c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 09:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f00b0d200050696d1c64977d5b17d79d SHA-1: ced2eff9191800f2dbaea8ff31c6d8f78532c496 SHA-256: 2cd19408a676455cca9767c825875c46268733021e2d518b7d7b3f1803073849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xedaptap.net/userfiles/file/66786015432.pdf In PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/jitukogosedov.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/30132425544.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/67865610763.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/rosekobogitenagewawu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qkc8eg2tk94be8sea8e3799sut/3889828289.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/36469459124.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pukipazibisofax.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/7725235893.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161304bc375e5c---14029739246.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/57289426054.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/tixexewidetuvekor.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/29882576445.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/mipimu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614233323d12a---rirodakabimoxutos.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/99239830795.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/wafasu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/33062136199.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/77852769331.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/89511530173.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/9834374708.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/besoparalaguwixi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe71d2730a---88473567054.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/53743281778.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/69769046605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+import+contacts+from+phone+to+another+phonePDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16692 bytes
SHA-256: 06470cc58a302c1ab321db59bfcdaee7d81a73775f472864ef886e5aeb108a88
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 10776 bytes
SHA-256: ed693ed8844e902a33f70ec39c0ae907f53ca73d9aa3cb6d95cf4551bfc52a34
font_02_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1