Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f4337a50b88922…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 02:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef64b7aaca4d4b49584ed28ed05c919a SHA-1: b954ac3d3d501b3a1943b49e6bb5184c1eb8ea6d SHA-256: 79f4337a50b889225b0897b8ed60b515054282b2ac005d3450064eead684a2f2
196 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, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_CLICKFIX' heuristic indicates social engineering designed to trick the user into running a command, likely to download a second-stage payload from one of the numerous embedded URLs. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://stavo-bazar.cz/userfiles/file/24542323531.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/76387311376.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/50314297847.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/xuzisalolexunijawulupumiw.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/bafumabamowufap.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141f90b729ff---pidixufe.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/dalix.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210905022715.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/wumiwukipapixuzumuz.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/palute.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/lafigimoferofevux.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/mesofilewobuduj.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/22166607578.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/7299413413.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vosiromikinufonopamizo.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/sikegapedefidejo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9cb3025b---fuxapurokuvig.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139794d9130c---pepigudirede.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377efb9bdd5---kixisevuxegatapu.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/juwijimuromop.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/od7ruf8k8qsfck7if92no01dg5/91214745144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=como+formatear+sd+para+androidPDF 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_off0000b8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 18088 bytes
SHA-256: 09095ea875a05ed7dd5b683aee8b151070a7a15cf302c0276af3834636f836e8
font_02_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10644 bytes
SHA-256: 2170d555314d84b7be6d79cb51137ccbbd2acece427bf201f2727e399226f620

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