Malicious PDF — malware analysis report

Static analysis result for SHA-256 933bd24d47e4f254…

MALICIOUS

PDF

131.5 KB Created: 2021-07-15 23:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea88abc2893f1e3dc21399cf7af73653 SHA-1: 06c100afaa168728e637a3eb61edc0edd4dc4750 SHA-256: 933bd24d47e4f2548bac4e5a669c9c33536d555cab1c2f60e0e1a9eacb1e11a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains, which are likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe631ba10---tesuwukepuju.pdf In PDF document text
    • http://studioaba.net/userfiles/files/82027805350.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2a0c51b8773dfca35634f669bfb9e6c9/tolelezalasor.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4577c23994---82066707126.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/zidaguzigeturi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/nusokajekusuxevil.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608466a10c857---mabiloroxojipo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b9b937aa---39872487484.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bcca4d8a---11192843923.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d085449673---49567646146.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/mipisomifagijofine.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/razonifurexex.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bukevunoli.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062006461973499.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/91834968981.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45954533331.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/sibokufo.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/vuxidezuri.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993b31ebaf7---wenimusibuvonikazisigijaw.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/wufulakezagexafuvojexo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f89557c61---mudemi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f1262553---gikop.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/52216379473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=find+the+blend+in+each+wordPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18978 17976 bytes
SHA-256: 58b7b8143db5adcd88c96d3d56d4b40be6e6f859c3802850f3fa14a452edcee5
font_01_sfnt_off0001b874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D08B 10504 bytes
SHA-256: 52ac906d15a4d3f7a5de831faf3377fa6c49fef76b0f001f98abc9cdd79ad533
font_03_sfnt_off0001e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E851 17456 bytes
SHA-256: deb9c80d0e59884fefc33b7ef05457f6b34e6979c6ed95262ec438477359d887

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