Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df26297f32cf3c7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 14:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84949a73aa6c7b56a62d2c17c3d6d0f5 SHA-1: 38b42262dab5d0d7039a08bb1eabae8eb495fbac SHA-256: 8df26297f32cf3c7db3776abd77f79cab2f00c07161070951d3e3c9d93b44bc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://makenie.com/upload/files/80240273166.pdf In PDF document text
    • http://cz-synergy.cz/data/file/52147308899.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/krt45t16ch6u02mumlbs98cp1s/11028122882.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nexemaziw.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tebodikarifimawiwamiwu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae3395d0c337109299e23db3492963dc/pogekoze.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109040234324502.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5347726---40062541944.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/11306324706.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/lerinutu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613159bbaafe3---93159185672.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/60888967091.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/pubamazo.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/71675435587.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bowiwemomuf.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/75219022023.pdfIn PDF document text
    • http://ccsl.asia/files/risosadobuzap.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/vipusibozipulobinaz.pdfIn PDF document text
    • http://used-machinetools.ro/app/webroot/files/userfiles/files/85344893094.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908090310.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b57f6f580---54680302266.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/68238770647.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/34647038436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+call+of+the+wild+full+movie+streamingPDF 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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 11136 bytes
SHA-256: 3b2848faca5c21cf7de4bf41c9e9621d211af847f322f4d6782a647e468564e2
font_02_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 18024 bytes
SHA-256: ec8fe75c858ab405766942bd87257ce0ed7a0265304da3577d55b614c00b9099

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