Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf58399b64cdd0…

MALICIOUS

PDF

97.8 KB Created: 2021-08-04 06:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5a66dee131304a1bcb88f72d97f9d6d SHA-1: d9656879e729a6d35789f810be761764e04acf8c SHA-256: 64cf58399b64cdd0359a0fca44836239f7332cee6c33adcda35137b2897ab296
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating attempts to obscure the true destination or leverage SEO tactics for malicious sites. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://queure.ru/uplcv?utm_term=what+is+tree+diagram+in+english PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d5055484---merelageza.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160996aaf8014d---nalox.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1e617bb0a---19012206285.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/77055828830.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/jurerotetokulidatugegada.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e694d96d26cac81c2205ef931a88a556/35013298623.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/jatukodumade.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/wovudezujul.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512121919575442.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/52946124273.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/kelifepajovunanumumupagi.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/18686109057.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/53297073724.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/jexoguzupajaxexanas.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/ribubidunanuwisur.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a991986a---84746934204.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/u9po6g3mvglo5nh75g0pmbf38j/42007832239.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7200daf4---varaj.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d6573205e4a5fcc532b51784a10a19d0/wulokinegepirevoledezez.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/libixodat.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/xinikugedanasepa.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/35230307026.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff9qcp0m2ksvisrldugqgf5sf/66222829443.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86ec53bdcce5a7e1a9135bd6a62c86ba/xokazamesegudekij.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10568 bytes
SHA-256: c253802949962eca8064fd46fd95a54c01ba3ab5061d5e7bd97a1eccba65e77f
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 22364 bytes
SHA-256: 094f927b0e0029fb1623f7658043929d18a2b5b4a4df1a059311ada6ec9f6122
font_03_sfnt_off00015381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15381 2704 bytes
SHA-256: 4c1d38471086b7ae4f403d505c2fd797bd5b52ca5027d67e143f4389e7c58c3f
font_04_sfnt_off00015eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB4 17256 bytes
SHA-256: bddb8335bc04269c13a5677158262a3ef467a477b58c5623758fa1ef8169db55

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