Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbba7c2efb6e0075…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 10:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 482fd939c5daa4685e7865c154ae4024 SHA-1: 766a5ae10476e8a5f9be50cd11c700cb4ad561e7 SHA-256: bbba7c2efb6e0075d899b3824b0ce932ec216b971282d858ae2dfe95ddf6a834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://n-production.com/upload/fckeditor/file/3642255265.pdf In PDF document text
    • https://keluargamimpi2.com/contents/files/20019447764.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ded126aa0---narifuratigovufexukusan.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/vuwesobomopanotixigadozet.pdfIn PDF document text
    • https://bhalakusari.com/uploaded/ckeditors/files/geboga.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/27620da9360d0cd7fa2941824ba6d255/73705605189.pdfIn PDF document text
    • https://harmony.im/userfiles/file/96979919964.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10602c58994bbb774e92a7fb38d21bcf/wibosuxofuwivuwu.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/magaxefepusurotedipo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e33fea561---zulugawaxotod.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8af44b54---kejamerezejavepukunibip.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202108291303499061.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160871c45e1bf1---87129605937.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210707002906_w6c9d5.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081213054157.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/97860708019.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a5hss7hokekk45a7m7hbqoen82/nunafire.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zekimamozolefu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/lupojabibexeb.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/34b067078baa50f7d5392f291e2ffccc/66278519946.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/26867086449.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/pexuzixagopamax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=react+state+json+objectPDF 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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 10300 bytes
SHA-256: 896b6951af1f4decd397df4c0d8c3751620dd2f60e4afdd3a2cb2f7d82f301f0
font_01_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 17944 bytes
SHA-256: febcd63e6909b1688bd60e5107151cd51ec1b42c8c2891deea3768b2d4dd17f1
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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