Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1876d497e4945d8…

MALICIOUS

PDF

99.6 KB Created: 2021-08-17 07:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c2c8094d5a0133dfe738b5ffa0081e7 SHA-1: db6de3270929d5d55f1365356f673db644f029ef SHA-256: e1876d497e4945d8154af56f8ce00722542e76b0e062c3c562666c7b98dc0c6a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure suggests the PDF's primary purpose is to act as a lure, redirecting users through a chain of links, potentially to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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://lncl.org/ckfinder/userfiles/files/lukotedew.pdf In PDF document text
    • http://yacpa.org/yacpafiles/file/83781396218.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/91027132030.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8d38f137abd1ccf4ae49cf016ec9fb6f/59667615854.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/g3p3527pc7o9o6b4fodimg0gd6/padonunotoba.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ktkg1clubmuugb7i7s1ht18lf0/minaged.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jazidamo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nebemufu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaba595c3---90747264701.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/figekefoxefizike.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7a0ds08i0gi2b9fj5e27l7r2an/tanejozigujivesizigafu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/935284ae0206b57460da1b701743b3d3/wuwejefivirakopes.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/55973332611.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/657980b7d5f78af2da50a63f93b814a5/8175125531.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/99076130697.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a510712c41f---madikilijotifewemuzima.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/67874458605.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1631348c29---96071696886.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/ruxisupu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/futarojuwijenekepuwumaxa.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/38233291947.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/79867226649.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/21332317306.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gojotekulakozunof.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/loworenelipekufupatekur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+theme+of+the+story+perseus+and+medusaPDF 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_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 20828 bytes
SHA-256: f1b96b5808ed7f78a1b930c7d5c1e0ce7a6d2d9dc8d16c8aa704bdd3be9ea748
font_01_sfnt_off00014e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16671 10924 bytes
SHA-256: ae74e67797ab2dfceda1452203c29de2346330a3b9df4b2445a71eb9fd7d12d0

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