Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9607817d1553b4…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 18:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 726154c8c6f443c595f85a1dd6e26d43 SHA-1: e734fae77e6dc7adce6b1ed9532bfba90f883176 SHA-256: ba9607817d1553b4b441e5b9f7be40d18eda673a185c74fb33bef490855c05ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kapsalonindex.nl/images/uploads/16535339743.pdf In PDF document text
    • https://rivaflo-south.in/userfiles/files/zawajifaxadiziteg.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/sumezegenovoravefi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/71330f15dc5034928b12b224ecad50cf/18835052624.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2799157e76---34290162047.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4d071536df0e0eb3cedf0492caf87ab0/11993657252.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/475b333c949ab86cba58387d7857ec1a/4548736913.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0aa1884f873c8f7e31a890e67f0f3ecd/ludiwesapanovagatugebu.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/pomajigenol.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a7bc8974---salavulidabowab.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5a40e1bd29ad04a48a9d124b3a0e254e/15803490247.pdfIn PDF document text
    • https://abeess.com/userfiles/file/fazefo.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/55741721523.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3j3clsvf097vvriqqo6srjfh4b/votaz.pdfIn PDF document text
    • http://landpas.pl/upload/file/91686378562.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/salononuxu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c14c3a40---gibedogudadakomit.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa80021ac70178d2dbe143cb9a4bff56/42855220272.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/um9gh0k9p9cjsljsnkiunbqeok/53999056468.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f9e9e5da5d635c778529fe25949e1625/kavamuroloferaronib.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d702ca37---zudaza.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4790b7f5d---metudutorub.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/99293267921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=max+and+fang+fanfictionPDF 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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 17596 bytes
SHA-256: 5e328942600145e287aee51090dadb7813cd0e159c559a5f86678f5d87a0dbe7
font_02_sfnt_off00013425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13425 10300 bytes
SHA-256: 0496cf07ad32665a631c293b144a7c3c15aa384dbf317b26e35a5279805c9bb9

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