Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c3403fcfca8d12…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 09:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1e94d6c8368c92616fc4b4b7490a58a SHA-1: 3dfad6da43d4468c7c7fe08810cfae6d427cc0f4 SHA-256: d7c3403fcfca8d12c82458de2fba9fc333c62d6c6b61e1152f2f970bf704d0b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://gibisch.biz/files/files/turesuguwugaxudew.pdf In PDF document text
    • http://eko-baby.ru/userfiles/file/55265107050.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1880ee35d65cf87fbc30b398966fd6c8/78482102778.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/22855879012.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/61218865510.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jozikupakasusepigabasejom.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/48022443272.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905231637.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/14997448436.pdfIn PDF document text
    • http://strahyi.ru/images/file/sodofow.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/dafoxaresafotulugalo.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xenob.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/bepiroronawijapemipe.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zimotali.pdfIn PDF document text
    • http://gibisch.info/files/files/bosekugagubakonilazek.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/limuganuxojen.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/63173262200.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d468851b1---84308160170.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/3998998076.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/60430092652.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/sazagebotix.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/93824259822.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210907_259DE7D1CA81C1A3.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zepofog.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcee59100---pudosilidesip.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/zitewexojima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=noizz+app+editorPDF 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_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10104 bytes
SHA-256: 915aa7efc89c0bc22b03bd760e14b0207ef183c4eee8dff402953e5cb9c9da14
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 17208 bytes
SHA-256: 111eb7d40549e14a3b115e2bbd226d3e18c9fdce642c532706f4dc115f5104e6

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