Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a59bb7498f04ff3…

MALICIOUS

PDF

95.8 KB Created: 2021-08-18 03:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a98ef5d60b134d99ab7ac079ac16a0d SHA-1: 996ff524df98bc04fd8e6d0384ee8ad9a201d1b0 SHA-256: 6a59bb7498f04ff3d832f72ccf28206f4d4730c77bd661dd8f1d32ba23641a54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous external URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://sicompk.com/survey/userfiles/files/36337448947.pdf In PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/vewamif.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/25630862687.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a5a64091---21239818443.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/kovakutibunowepefalijomir.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/nivisipodudoledixovumenaf.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/podozov.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/wijakezusuwalemulezu.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/fikabewezaz.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/sugojawesadolomaxuw.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/26650274415.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/75605001174.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210629045040.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/65283970410.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/93158390454.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781b05df8a4---73781863840.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/10580359244.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/10573481592.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e33a6c34adc9721c7107d0dd012478ab/60735193512.pdfIn PDF document text
    • http://kotolantopeni.cz/file/58588403491.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4946d5cd---gagalebisitodufiwawaxep.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160735b643e045---rejeduviperimumilonu.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/wirofefuranutu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d202675b8---zugixudok.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8fb27f3c04afddf0ce7c02d5d96066a0/nuregakiwariraxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=telugu+mp4+mobile+movies+2020PDF 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_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 10720 bytes
SHA-256: ea14b873fba7cfe18d204b10fa79c8ad443ad2cb259a640860730f3233adc8af
font_01_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 18056 bytes
SHA-256: 15d4367feedd63aa152f6ba91dbcbe80ee508908691c6a4d6fae49ba971dda94
font_02_sfnt_off0001588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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