Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b72b911041262d…

MALICIOUS

PDF

92.1 KB Created: 2021-08-02 05:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bc6e6e7a61b364fa554ae7ec65304e6 SHA-1: f7a20f028571ad70b467eb66c214cc723e6bfef7 SHA-256: 23b72b911041262d5d321a300d0840ab1a17001ec3fb343c582599035bd1fdb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dmkaudit.sk/101/upload/file/58463494694.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2985338135bbe213b5317d51f192bdef/lovanezumegud.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/12197510349.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/soweb.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e6d31e03d---bodumanewozipifeko.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/lapof.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/55764192041.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/xiwuzobebozeguregiwatos.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4be449df9fd59d79a52cfa1ea07f2b97/lenumaketepenus.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ff993c6cb21122ab6440ca4a9cc07d16/52974716392.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/povifuxuzorew.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/dd7b1cf02005de14b22807fe1a97213a/29558894562.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/tukamizin.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/d7k6ht9ba2gt4iv6kn7hc4otre/nivotudonuzofufawutir.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ac719920---13406186957.pdfIn PDF document text
    • https://doganagolosa.it/file/xubitojirowixujeliw.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6ad739a7265752cf49cf7c0aec5b6b2d/zibelutidox.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/btvkdf7aigme7dm4jou92prqm2/lewojipuxogegisawufa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69a8494da4---wedatam.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/kesimimok.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/49083487126.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/16163520090.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081160fa3c3a---10270343222.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/lonotelixowosodiviga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+resueltos+ecuaciones+exponenciales+y+logaritmicas+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_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 17272 bytes
SHA-256: 8f8fb913da82568d45fc6dd4d66d05f6a96327225dc6f4c2c9f2deea3a92889e
font_01_sfnt_off00012ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 11392 bytes
SHA-256: 920e957b4c647ddc75378edbef5e97b901855e7df91f8ee2e17b372a72d4e96d
font_02_sfnt_off00014788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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