Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c3fbd108a17f5e…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 05:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 17f6a7ca4745c991d2bc8b800f33c701 SHA-1: 83700ac728bae1e34eaa466c361a545883237efc SHA-256: 72c3fbd108a17f5e456b1b5639181755da9808ad5f07299a63cc837ab2df1f69
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, while numerous, are primarily used to create a deceptive link farm rather than direct execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/af8533629327a2c0df9dff9ba787e88d/ketobujoripejamovu.pdf In PDF document text
    • http://tokyosushilohaus.com/uploads/files/duginuderuziseze.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/zolozudidugemifi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a510a95c---65132474167.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b968eb98950---winobaxipinizevix.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/56988725557.pdfIn PDF document text
    • http://delve-cr.com/uploads/78804010331.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/60af4c1f58dffb889185edfdfa499ce9/10988992683.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/64273011242.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a40e392053d11dd555b9d7e52090b4e6/90286578776.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/norufa.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/pumomesezuve.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/lidikaf.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/47393304331.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/34832509957.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/fufufemujetaxuf.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/xixepovaworivesujinejete.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/sokutivuwukokifufak.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/getexajipoweziw.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/limuwa.pdfIn PDF document text
    • http://funperm.ru/content/file/mamesumazokuzajore.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e6480b9d---68910032988.pdfIn PDF document text
    • http://learningkey.org/userfiles/89889209319.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/32581949982.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/25d6982649d2e2fc8bd648c0f1c7cca0/31201782728.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fd54d82181b27a756dac7f53ee2d3e8e/66800142538.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/giwujadukebitix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=will+going+to+present+continuous+exercises+with+answers+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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 11180 bytes
SHA-256: 1249406dba64cb8ba7b4b26683c9e0d062fc8949e92e016fe3a03cf443869631
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 17912 bytes
SHA-256: ed85dbed91521a3849a862ce633b74a951d09a4f54a72a951aba4802d00c3db4

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