Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b8007ac3969da…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 04:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de8507848d3b096f22bd4516ee090234 SHA-1: d4732788e4c2e04c1f3eaa9c27afad8f6bedc6dd SHA-256: da4b8007ac3969da90219b936fda59625cb8682396c761f78bdecb5e298f2e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=tvalb+app+android PDF link annotation
    • https://yensaovinastar.com/media/files/mesabagemofigomedag.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f71227755bca195edf67eadc5d5583b4/bexujifubufomojefitur.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16144589c12ce6---ruronusijivaw.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/diraroxebej.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210906_4A01CB32E0531C15.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jumonelenutezoxonife.pdfIn PDF document text
    • http://chinazzjx.com/d/files/33025452027.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/85d12bdb5621aa5202d63bd8415ef54b/58690811982.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zazevagepuzi.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/rosatusewebox.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/kesatifovinarupemofoketu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/5063456042.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ef958801849a7e9dc8838bfa332dfe95/51301269823.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/77927711673.pdfIn PDF document text
    • https://costarica4d.com/contents/files/79728882748.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rupalunuwunopepel.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/99828238660.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/mamoxijazupewofos.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/vavumoxita.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/30271486633.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/varubuxudodutiv.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/93453847463.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d498238a---vogofofovazezutomarikezit.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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 18564 bytes
SHA-256: c93daa965dea1ade1858eec422bc24f157b25568889b72668b0b055a15fab052
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 10156 bytes
SHA-256: e9b37342a6e1add578d2bf8fbe15415559378335760fc1cfd64594f2f3046817

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