Malicious PDF — malware analysis report

Static analysis result for SHA-256 6203dcff3e2eee65…

MALICIOUS

PDF

87.2 KB Created: 2021-07-18 21:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20a6be27a88eceb9469849f9d9768c3f SHA-1: 7feb1b7bf56819ea8b1f8631c71e19c39083908a SHA-256: 6203dcff3e2eee657a26b0a3f25c741ff939cf4bf43cdfe71680c24af7e272f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc426c6d---jukemajavezuzunuxijab.pdf In PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/duwewufedaf.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fb3e0b170fb7675150f90e484d5716f2/vuxofojegaz.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/74447466603.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/91555301559.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/80428962803.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1624809974xutebovavajinemej.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jnhqot12ir2stafjothppq40lc/lawazu.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/beradoxavox.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/dezep.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989503adf1---84402953105.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/buburuwafalefutasa.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/69866521225.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jigujobevetuz.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/xuxaxolozum.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0178c9eac1---mamawibararerukupunozubar.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607df589239c8---vikajula.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/smj00ck1k9c9i8d68hjmm6c0fq/kefewimokumoxe.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160777becea2b0---lixopovajututudujebaxu.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/33521153042.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/82311927558.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k2abmpnj7hv1iktlp90uej38o7/59550616126.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a0a3a72e7c6059bad0612b2bf96146e7/18592946187.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f996a8004---tolegexagivojujedowonaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=taylor+swift+mp3+songs+free+downloadPDF 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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 11176 bytes
SHA-256: a797202e9fdf1416416bdf9bd6f75eebb0c2a8091adeebae2042450003acee8e
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 17516 bytes
SHA-256: 5e7f539d086bf71d824b17ae382dbdaa36cdbe9dae00c5df57426e343034d965
font_02_sfnt_off0001376e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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