Malicious PDF — malware analysis report

Static analysis result for SHA-256 def3330bc272ead9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 19:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 978198a7aae653f3f1483e6f69b5e56e SHA-1: d1aee41fa8c4bccb9ddad19f4c54c693a28a6b77 SHA-256: def3330bc272ead9cca0106d42645e89e99f04e001787219a777ef0f74bc3639
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://camelliafb.com/uploads/files/202109010549358110.pdf In PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904035534.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210914165839.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nazaxodedezokole.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5906004dc85ac7c9d7a129e98337f285/jadovutegatofaxezuj.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jesokoxexakopafurevogu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/82920407361.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/gegakekuwu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/22723835556.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2iu5no1vguvg6hijt871sakc61/mipoludotuk.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/giwinidikakaloz.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/9988363890.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/moginuxawubosavifan.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pewujidak.pdfIn PDF document text
    • http://mousike.it/img_ins/files/purulujaxogaror.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/tuxusofafowoji.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/nokebapak.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/videdufejex.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16140375c04070---24658463523.pdfIn PDF document text
    • http://lagrupacio.cat/file/3180731520.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/pijuf.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631282069.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/noxonovovemure.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/9882045528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fx+file+explorer+mod+apkPDF 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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 10460 bytes
SHA-256: 88763ad7fad2b21c4ff09182553689d9bf339f91fdd14d8f71345eb8fa2af4d4
font_02_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 19392 bytes
SHA-256: 1bc573e7a7d687e8a7fea5e2324dafd2b49a5b400e219bbb905c6687e422371c

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