Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7a89028dd42125…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 21:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9baedcda9af6e76aef9c66d9c4b54f1f SHA-1: c68019298cdcf55bf748900c027063b64ac2427f SHA-256: 1e7a89028dd42125ac0ec66ada621be9e6d8873d29331ad73deee5b735464289
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bukharaatlanta.com/sites/default/files/file/nolozesozipizatatowir.pdf In PDF document text
    • https://cortopolis.ar/userfiles/file/linevuxa.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609839b7a0e07---bipibikox.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sinujemelogezowikip.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762a28980dc---40053739690.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/4431526889.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kixaturefezuluxik.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/fikuwugelakajo.pdfIn PDF document text
    • https://topupdana.com/contents/files/bafufufagelivoxol.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/kajowufuvafupusab.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/c3c37aacb92d2947022dec1809e5a634/36654539052.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6e559a32d607d1df16ac4f8c759e7dcb/siroxagogujovu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/78706898230.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210719_D5FE17B8C546B3E6.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/wupovesa.pdfIn PDF document text
    • https://aitalk.vn/upload/files/zapimodogiju.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xaxuzunafimefalutafunup.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210802_AEEBB41691B3A29D.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949855b71dc---11852762145.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5d211e800740ebb3e2168a8f815595ca/92001644259.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/zugelan.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zegesozinoxezanutoto.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/06b127ac1bdcc1a86b148621a3c7fbd0/64350319470.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5989fdeaf3a3e33cf55a8a2494e85cac/16357642466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=punctuation+rules+pdf+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_off0000c02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02E 10800 bytes
SHA-256: 724a15525351b807f345b091f09a4f1e10f74b057050e2e02e6237c96cb1c575
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16384 bytes
SHA-256: e565c88aa013818d20a4b82aa8595353fe84fc75adf921838a80e8cd38320397
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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