Malicious PDF — malware analysis report

Static analysis result for SHA-256 c073e9df26e73daf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 11:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19b82135d38dfeb19cb94feb2bba25a2 SHA-1: a515fbce7fa333d9a8df6831f663ae4a514995b1 SHA-256: c073e9df26e73daf807cbd22fc53f0175a5c52f666bb92e8af4d0e289e4f54b3
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. The presence of numerous links to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://icbacademy.com/upload/files/pupasiza.pdf In PDF document text
    • http://deshdunya.com/blogimage/file/5620522098.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/45082903418.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/8294895193.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11aee3bdda---silufugirukosuzibuv.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fca0184089931c8c856be600e0cef555/rusulifokomomirimimup.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/317228347.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/fuwaz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/rexew.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210721202143_1594346969.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/skj1iugbrvm66vgnvjq8l916de/gedadow.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55dc10e7cb---12763337876.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zexomi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/19260261994.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/kexetutitujun.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/xewulikedivipudaba.pdfIn PDF document text
    • https://temahr.hr/files/40538188946.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/sabivepu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a1ee614ac0263471dad12c22bb858939/jipuvajiw.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/satokotela.pdfIn PDF document text
    • http://picassooutdoorliving.com/fckeditor/userfiles/file/31300081427.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab844d42b---12773215467.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/sexomepumazasugazuzobawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+convert+a+pages+document+to+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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 11068 bytes
SHA-256: 015b16afd3ccd38534e05fd1c49a2f2b61c8e522a16faa1499397ece9b4ee940
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 17396 bytes
SHA-256: f1a86ec374290722eefb665873d6b5d9dc776fc4a3a59e01d8ca656c13aad16f

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