Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d5621b095db7c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 04:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a26166d371696bfa30fee9a89d8c4659 SHA-1: 47ed5c8ace79560cc2e6e6ad7fb86e998c90e3a0 SHA-256: c51d5621b095db7cc7611f4a297bbd1d25c787435fce8c5173b30b888e5da601
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and a compromised CMS upload link indicates an attempt to redirect the user to malicious content.

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://timnhanhonline.com/upload/files/83776087214.pdf In PDF document text
    • https://yogaspotny.com/userfiles/file/nivodudepu.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/kixaxogazegikuwugex.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/mipaf.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/jedow.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a6144551---vozotujofuz.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/25558845078.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/63780974224.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/powatik.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f663c79e00c---14849809838.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/66a67ce7a97dfe24e8dbb45697c8b3ac/botaradidotede.pdfIn PDF document text
    • http://vlajamo.cz/images/file/68711344128.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5ff1e10dee026be1674a4642c021153f/fudufixuxebo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f80fb55b911---bomibotutisunenesu.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/20260957752.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jesojuvef.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/bedujakapesa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e108ddb0694---1819953356.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/unh60rl4cbk84u3mv5f7k5bf85/74084049669.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/jolufodepadije.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/307752a20b600d66aa6004c4b67cb9ba/kizapegeru.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/weguriduwatov.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b76809bb7---73264038389.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210618_090919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=principles+of+biomedical+ethics+6th+edition+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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 11196 bytes
SHA-256: 0aa3d2dcae7e3fd9025213fe340c780ace036c4f2fb42fac1f921716c49ed155
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 18688 bytes
SHA-256: 01a216c7501bf7ec4d98dd22ff44615f446e3b5cf14bf5c9ef3f2b9a692b02d9

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