Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf63a08138055ca…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 19:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbbbec7a004a9b9334886e33511672ea SHA-1: 39333cda782461676a0782c102cfe3e9cec0700e SHA-256: 5bf63a08138055cab088e7f7f35f810e066dcabbef5888abbeb5e00ff5601780
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=2+cloves+of+garlic+is+how+much+minced+garlic PDF link annotation
    • https://motodubai.com/uploaded_images/files/nupofagugi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ea78e0e672226a603c1436dea287c22b/ditolox.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/nirelis.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/59142342277.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130523c0b16a---validavaduxivuxuriropakux.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/mowifoxozisuzepuwo.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/53961051645.pdfIn PDF document text
    • http://besteva.com/upload/files/gujupaditigidinowepaxuko.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/72525739342.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/pipow.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614324d18c0be---wasaj.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/vuzurepigibigidaxax.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/vibinezoze.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac5171f6d---35690702529.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e012c2a2---15696038880.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/kopizad.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/towulobokapelakusexowise.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/9884495486.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gotogulowenu.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/nutavavaruf.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/39532201686.pdfIn PDF document text
    • 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_off0000af7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7B 15244 bytes
SHA-256: 815d74402e31a195fa03caff725815ede79e949b7cafebc51cdfb8216be7048d
font_01_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 11100 bytes
SHA-256: a1be2763b5d56c5f0a57cb753ec919b2b36c56dec664b282935929f7bbbcb994