Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc46ebdcb4170df…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 04:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f32b4fa46b5e76c433743a2bfafaae20 SHA-1: 8330291238760c7f549c77a8a103d719598a6df1 SHA-256: 4fc46ebdcb4170dfe4b9639b809dfcfd16350a8cd82b208e012316b2f4e67dd5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. These links likely serve as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb3da9f5---romokoxojigagab.pdf In PDF document text
    • http://achwvs.love-mrt.com/upload/files/86341445718.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/nadimosulufuv.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6decda64c762447ba376d1803778c1ad/34933380636.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/52363771191.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/lowuvapoxigikomaradukika.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/dugufiga.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/susepuno.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/28625162021.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/9403868597.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/74470505772.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/7373038494.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47635487878.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/46339328348.pdfIn PDF document text
    • http://samtekelektrik.com/files/jawatudug.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fuvinazipewefit.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161303eacb3385---wunopesufex.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/givar.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d185558d7---degagetavimazar.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/84007443983.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/12337093454.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/mivogevonesata.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/doromuburomurafifuz.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/92374889181.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210831233244.pdfIn PDF document text
    • https://edgecs.com/documents/83380385033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=oreo+tv+new+virgin+apkPDF 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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 18024 bytes
SHA-256: 45512a24a20702e80774b1f1e45954e2e3d914727a95bffa8f5b5a9e7ae43bb4
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 10480 bytes
SHA-256: 5f413c9e340571a283c5366621942723a6c426533cc661bc1b6109fbb502a79a
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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