Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b18b38eeb46dfe…

MALICIOUS

PDF

82.8 KB Created: 2021-07-30 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 555c95957f7056d4ece7dd9e6d43ed82 SHA-1: ad4dddc83c626a833b958353cddeeb3733a104bc SHA-256: 77b18b38eeb46dfeede9e8570ad72a1e8d7b4f592dd4b2c2c5c92b025f2ec876
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm hosted on compromised WordPress sites, likely intended to direct users to download a password-protected archive, a common tactic to bypass gateway security. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f62156c12d41d89b8e9e2ca05442caa/kuduxavazuxofubiroramob.pdf In PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/likatol.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/48430261577.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/vibirulepipobotofaguxikek.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ko3uta1gjj5m5ug6ejombbol1t/40832867317.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8100b852---fapimabodifovoxidideki.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec9da33bb---pujajijaluvunajasupijo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/36749709b2229090e18688c206562385/dusinup.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gajawukebajem.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/71855261967.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/25146820223.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9qi3ollo2djea7jmp7omsmne7t/tikusujidunupamezet.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0l3ihfgqa946ctdhqan74jpt5p/21857564098.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8b6d6adfe066457f2ee919c670708b5f/zajixapetawexotupix.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/15295536535.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cb276877---nasotok.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/megufovupemuvinuzekol.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/govudujisital.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721404780b---65450748401.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/zebil.pdfIn PDF document text
    • http://farmina.ru/uploads/files/75026111001.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6d84f9ed07ad19aa4e390cf43585a772/24089291245.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/1015023636.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/61362603274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=programa+aprendizajes+clave+segundo+grado+primaria+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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 11220 bytes
SHA-256: f4d51f65263b3c761b6f81a44ef269ec2701aaf858175e461037287900de7a78
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 17876 bytes
SHA-256: 2f70744d8df1737b26174a0db47a72e3acef7f70630da5e70e177a25c9787f5c
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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