Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbbf5fa9cbeb582…

MALICIOUS

PDF

87.5 KB Created: 2021-08-12 22:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2160bff351f98a0ee665ca66d613e33e SHA-1: f79f5e9f553d82dfa7acf1fb76ae1c339679e8c3 SHA-256: 1dbbf5fa9cbeb582a25e2c82a41002cbb62d3e784b6ba0a30db8da5c44a019c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a link farm hosted on compromised websites to direct users to download a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a payload, a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://architettipassarinmarzotto.com/userfiles/files/99484602791.pdf In PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/nrvbbkpkk7m42154c0ldndl0u5/fatawobixamedunaberowon.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/wisuzepinuvavebirixux.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/sanonuzofi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161154752d9bf8---78557335162.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vnd787el6p259a2apaeoiuqb87/tonezoguzovasoji.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef874a1c60---85899018250.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/38452050424.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/mh23v4lg44am9namdolssghu75/niponewixuwudug.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/zegofajeronotosodipi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4f8920a2fb302ff199616c4cf6f5d451/64540006468.pdfIn PDF document text
    • http://netflor.pl/upload/File/32447003814.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bj2j8828ou65adtvvg2t6ncmjl/73238051614.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609123cd51b6a---tatedumodiwifabisalo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112913330f17---goguwibidagolu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5b1499f37---34615169260.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/lojisilegosinuleradar.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610afe50213af---nipax.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/debaxemowafinu.pdfIn PDF document text
    • https://rinducm1.com/contents//files/66854251738.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa56520a7---4146890841.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20ab32d0b---68299995924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=descargar+office+2013+para+windows+7+32+bits+con+activadorPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3f07031bd7aed1159bfa3b8aa3b1d59a/37919034017.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 18908 bytes
SHA-256: 8034139477cb7604b05b4e8281ac2a630ea26caf292ee386f755b31a2b53a75f
font_01_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 11560 bytes
SHA-256: 408447c136f008db72b98284f7ac50951494279639785b05609041bc87f21dab
font_02_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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