Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a5a9bbb1fa1449…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 11:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5448b3eb0f07a14ff8ff0a032af45bbc SHA-1: 99fd5d358f5dc8e575163babe25a8849b183a755 SHA-256: 04a5a9bbb1fa144944aeade15336197c8f53697884691ac8a7c6e403dd484b71
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that likely lead to malicious websites or phishing pages. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic where users are prompted to download an archive, with the password provided separately to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=verbos+en+ingles+presente+pasado+y+participio+pdf PDF link annotation
    • https://sentinels.ro/userfiles/file/widifujitomowolepefeveri.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/1702222622.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/juwevubapiriwabenasog.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c554120e91106a3587f5fc46ad34e5a/87135184156.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07e36ab00---88119683822.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/74419183298.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/08aeb177754e396c25a0d650c8f3d138/57252154626.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/823d8ffceb6c70a58e4a43a8466f0b86/samabafe.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/xiwojuvufazonaj.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/652be4b891c3f671d2ea0a1beafdbc2e/55322064553.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21f59a0d0---wexina.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nalisatixuvagi.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/52147186117.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/30558683666.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacaec558f---batavinenadotewifofubadu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f52970b6---xikixumiwosofa.pdfIn PDF document text
    • http://recviem.ru/img/upload/kesamugefarutafo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/48611844240.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609445bd233c1---fumaxogokufotinigagaz.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pemirubivonopelivogef.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dd210116a259e9ea8ca7729bc6e694f0/bujakusujegaworasopete.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210822/files/20210822052248.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55855553012.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210708/16257461435093.pdfIn PDF document text
    • 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 17516 bytes
SHA-256: d99052aad99e6dae2665b020b039848dcd00f65a472b59878d5c3d9781ed7595
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 18368 bytes
SHA-256: c3b173c8bbcbb685d14c7f93998e973a29f10e689a7c2239e8ce7253afa511ed
font_02_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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