Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19bc284958b540b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 07:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb1ec87482c0e3e78c16d0ca0ad7e060 SHA-1: b281177c87d33aef83092f95ed6cd1ad56d9ea41 SHA-256: e19bc284958b540b12e35e2bf534f2aba1fff838838a9ef9eb05222f7286b4c5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etabetasurvey.com/userfiles/files/74705225883.pdf In PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/99969273866.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/008ff80a0336f2a4fbfaaf0306b069df/51410736071.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bddd8b5bb---54869130054.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/wirowitusazesujen.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b3fe97f8db55b0c256d0b78d15975ca5/befowujebib.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/55720304136.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8628078f79dbaf90f211f69ae3523f54/13289167245.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/maduronumerimaga.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e72e106d---sefowidimegozuv.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/sedanoxuzele.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/guvax.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/19227591606.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f38fcc2f6---28805961410.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f11dc432345---rexofegik.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b649d2763c2d3c197aab6a84a6c9fda1/69831022686.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/4544058496.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5cee75cb---mumidak.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/lekam.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/e8id9nodfuida38on5jpnt4u0i/fofodu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608938863b5f4---wapukufuz.pdfIn PDF document text
    • https://bliznacite.com/files/wirasidumagijalipe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611219fa6b599---nuzesumodugok.pdfIn PDF document text
    • https://luminex.pl/upload/file/zaputesuzinag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=principles+%26+practices+of+management+book+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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 18252 bytes
SHA-256: 9a55aabb341ee78671d0348d163018287022b82cfdc98f16039ee70bef22659e
font_01_sfnt_off000120d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 9984 bytes
SHA-256: 880a3bfaa717aafc9fdc9ef765ff16afdeb5ace4ecc84980d6f8769e1e7e540b
font_02_sfnt_off000136ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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