Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f7d6b0293c6039…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 01:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b77ddf76f655d73e74e361b75495db23 SHA-1: 70dd0ad47950197170417554ae5d1fa113b5f9f3 SHA-256: d1f7d6b0293c6039e4839d8e53f00f26f4195711bcffdd6c7e26a4b16363e207
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' and an ML classifier gave a high confidence score. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of external URIs and a compromised upload link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wadsoda.com/UserFiles/File/ralobobarigasaki.pdf In PDF document text
    • https://smobiil.eu/userfiles/files/19192538872.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/75953517858.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/niralagoledegogerovunago.pdfIn PDF document text
    • http://vtaky.sk/media/file/xetiriberamape.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/60491391032.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/31046500446.pdfIn PDF document text
    • http://metallpress.info/files/gubafatusexaxogo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/56861241056.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109152043328609.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/31366182838.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/wavoxamekikomutax.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/zarulidulevezuwujumanez.pdfIn PDF document text
    • http://m2m2design.com/userfiles/81470431495.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0b6f32ce---62037312906.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d8ded43a---rodujuzizutozelit.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4da67893---65151971546.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0292cbc54---21812478889.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/26287990904.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210903210127.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e769c8888---41736602356.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/19279852547.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/92221047299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=droidsheep+app+downloadPDF 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_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 10476 bytes
SHA-256: 4ee094a7a7feafb7e739e2a4ee7e0c2d84ad852f9cd8b3eac84291329ee53802
font_02_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 18052 bytes
SHA-256: bfce29e0db5c67b398aa4373c53395b94cee38a5403fcb83677d39fd0604d34b

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