Malicious PDF — malware analysis report

Static analysis result for SHA-256 4572687815b35b6a…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 14:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08991300a9e6c1f35b14c542794b57bf SHA-1: 3314a8d700b525a1e6f2cb87574fcbea52e92c1e SHA-256: 4572687815b35b6a787406d5c070b9652072fbb8de041e8f759d8103202d1802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4651b27af5c43a24d8c16ddb7160e5ae/1108421675.pdf In PDF document text
    • https://mclandpin.com/calisma2/files/uploads/80845609281.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/66383965708.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/silexuxuk.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/1925448788.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/894b1c033eaf24bd463f8026013f043e/58999170983.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d95ba74cb070490bb41e005e20f3d16d/tesagib.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/13fad5ae514f8f15a0cc6b0bbb47219e/sejoxatetix.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/jovudafugujaxobovosotisof.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b12c88229---62245290534.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fef69ea1---31457220916.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/36090366606.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/05211a3aafe314e4d55265f6fc79071e/62761712464.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/kexolibazivaromigeguf.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/72751504433.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a84ea1e2d0---vidax.pdfIn PDF document text
    • https://mmszke.hu/files/file/52861778688.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/76964046642.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/76608152158.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vmfqc30p34ba5r0m9klmfeumss/zuwutatexajokexeja.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/jidewipajumubut.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/5425341432.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0721691bc0---rugudisorulebotuporo.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/14971948355.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82a2a9afa---gobixajosalimuzuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=book+review+outline+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 10744 bytes
SHA-256: 167780bddbdfbfeeeddcaa65ede39f4f93638ced49ab3fb92e8bcd70f8e601c5
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 17616 bytes
SHA-256: f96a1397e9322089769f0cf7040346f4f11ada5cbb53f232f1fcf2b1c24b701a
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16556 bytes
SHA-256: 5d6ca59f4749429991c2cf3e1a2b84e4335ccc2109491a98527b86ccb31163cf
font_03_sfnt_off00014609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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