Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ab4440e5606fbd…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 19:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53de977225de4d10657359189dfa9790 SHA-1: ab80958a8a6a4506170006a617d700fd0a4ae2db SHA-256: 16ab4440e5606fbd23669c43ed5c72969d2cf6d3de70e12fe982c30ae956a1c3
156 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 pointing to compromised WordPress uploads and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://oniceh.ru/uplcv?utm_term=bubble+gum+simulator+codes+2021 PDF link annotation
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b4e11a36cc8fe731876f04baa1990e6f/89723352746.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/5614736988.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/xifudibil.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8dkn6096a880oj94dg6jhesf1f/wedizalixavewuserisubota.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071895e5c3---jevidowit.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911095929_ik882n.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/47270569384.pdfIn PDF document text
    • https://shibbirs.com/media/files/xudototuwizasaxo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9dd1a395---tivom.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021944882409.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iq3hvbfitsbekf6e3smurq87o1/kowagovezepozelimivup.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/zejusanodize.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/wigoru.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32568159579.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf194082b---jalezuliregalipigupunut.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/28987678198.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/90141297283.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a781dfe5f---xibesuxamubaxa.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/46619711251.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/30716128037.pdfIn PDF document text
    • https://estoniapools.com/contents/files/47036975324.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6249a7523---muwumigitajole.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/gukoziluforutivuvis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 16604 bytes
SHA-256: 34cf9aca5ba93fa56e2e998b15aa208ba61562c4a24baa23668aece8f07ebeba
font_02_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 11196 bytes
SHA-256: c6af9c9906fc953c848ec2105334677aa42c34321e1f2348ac51062740d9fe27

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