Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd006eb8dfcb1d18…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 10:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c62d15b9cf691a171d5e496f4ecea84 SHA-1: 7c9760fc12dc151f6f9b51ebe99fd71da6e42dc7 SHA-256: dd006eb8dfcb1d18e44959eba600ae99483688f03a3092d01ef6f8396819555b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. These links likely lead to further malicious content or downloads, suggesting an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pune-india.info/userfiles/file/sabovonoguxununugarad.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/1605328772.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/54737926843.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/xubakuzeki.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/63954316745.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1f1etkqi91jvvmoog2ha4t1hdp/88266693053.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dibuw.pdfIn PDF document text
    • http://someteme.com/archivos/_20210916114758.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/dbb2449d1bca7570df604d77bf9d319e/94141798773.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sevebipupiwa.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/diwomigewakenine.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/39445491445.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/96878367774.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210912_F86CC3DDD805D647.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/53179993761.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139784d9397c---93931247584.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/pemidojivutabakezez.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/8721427370.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197220582618.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/sosabizejudu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e28e74b3d---66266823428.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/jabawaxotiruvoxe.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/10380645110.pdfIn PDF document text
    • http://tavio.su/files/file/58267024339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+movie+streaming+apk+2020PDF 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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 11004 bytes
SHA-256: 33cc8088443cdad663f0881022bff292dcf2c06a76015cd2d3b69c7c7760c5de
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 19288 bytes
SHA-256: fe1b5f05ada5e9b7f23d95619eca2c584a4cecbce96f620228f937c0b7a6789b
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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