Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd58b6da97c1fb9…

MALICIOUS

PDF

92.4 KB Created: 2021-09-06 16:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed03882bc5956132b7b81b5b0c36d807 SHA-1: d75e9275b1116e90e30f2ed5b9ab4c0d0d35e024 SHA-256: 9dd58b6da97c1fb9943c35e05010c2f86e8f056a86ee4d58cfe30b1a164d725a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://indemo.pl/Image/files/bawed.pdf In PDF document text
    • http://dragonspond.com/uploads/files/woluk.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/qderaph9q3ngkbdk4q6s05nkc6/bovudusunagelewaloz.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bcd8c15a---juripanuz.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/38689537722.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wekuwafelixefivoj.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/56826857261.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/71921926200.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/17f4ab9744fd4e1f347c4afd252622ab/sesopewunirozagogadaga.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f840c4a32a---nixadotimila.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/33726904485.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9st2ofqu23jvlbbv71olt0g1n6/fafabediga.pdfIn PDF document text
    • https://shunnasato.com/notaba.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/96698067554.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734eb87438---fogudezanejegoleji.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d764d66gn5hhb6c1283m2cm166/84851486423.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/4224531015.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/tegazobonuwiz.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/lawumipoduvinoxupikiwi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/185c1182cf1b30fb29828f6d75e4667d/11931711207.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7cac484a4e01c0b4c3e896fb24701ea9/zapovubofab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5a6010af9cd0e005ce905117d769aef1/zijavopetinovowomozenot.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/96382961136.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d959985ceba---wesupuxifogijifo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e3aa4982723c1333ba3c99b4097915ff/wevux.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77debf88f---18635465960.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/dapamoxonuzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=thrive+casting+crowns+chords+pdfPDF 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_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 18940 bytes
SHA-256: d15a0b59d703465d6d7137a17ef9e202bf27d3945092b579293b2ccb99ca249f
font_01_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 10968 bytes
SHA-256: 03e4ba89ce41a6e81ca088560964212aafa631f2227698548b3c7bca39f2240d

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