Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c7d3c6b7f5d1d6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8305823e8a829dceb5116cdb5043159 SHA-1: b4af5ca6aeea147913539ec44dfa83f5da567205 SHA-256: c7c7d3c6b7f5d1d623731d47f2904f6289a463d4695dad9492593a215ff28b20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ride.hu/images/uploads/files/dajinofibeluzerib.pdf In PDF document text
    • https://dmshospital.com/mm_engg/files/matokilajojagano.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/9281321536.pdfIn PDF document text
    • http://iucecb.com/files/file/jadofofena.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/wijukafotijizenowin.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nojirixafij.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494cb460abd---fudukabupif.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/fenupizinipumefapuserez.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nojuzuveturilizo.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/lowiros.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210921172927514174hucme.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/rakoxegarepogukijegizilat.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28464174892.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vibabixavipip.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodiranugo.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zarobuvokowen.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/45572853871.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/gokasus.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c8ea477---jofivaxibopu.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/gipokupixivaguzoliruf.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109211311221534.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/77289257047.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/24910115979.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/miguminika.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/80213148795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+any+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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 17556 bytes
SHA-256: b1a17af07795e853a4949a577c4df9f999e4660c34127e688984fbfaf55597cb
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 10120 bytes
SHA-256: a67da3c5ab21102ce305656e410beeb8bfda5cc201109d5e9afe5edec8c996c8
font_02_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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