Malicious PDF — malware analysis report

Static analysis result for SHA-256 3725315b3d41f62f…

MALICIOUS

PDF

98.4 KB Created: 2021-07-18 18:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 852afbf845c82822276d2911e52e7e1f SHA-1: 071d84bc697fd05a7151de955329ce404c0ce334 SHA-256: 3725315b3d41f62f595336ba65ef7aa6aebbcdcfb03819bc523e40e1cd6bdc72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The presence of multiple links to disposable hosting and compromised CMS uploads further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://huucodatlanh.com/userfiles/file/lusavagamexuxibukef.pdf In PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/65935488003.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2c8687cbee90dae8b4b303159782aee2/96067627328.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3d2e81e3a85974825cc9f9b21c2f7452/9326194857.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/89174027180.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e883575c36d6f1d35c24c997dae72095/64858663759.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/berev.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6cf6837b913a70730fc5ed1f5b36eac1/doxanabozisolidovo.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cc304f4b---tenotepitudegapejamumere.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/60134302585.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16093a734a3197---zedetobosemo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a64f378cda9a360ba2374abd03955ab7/2565340845.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/28544267239.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/kotofeximosoxux.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e706ccf1---fiwesoxomakexe.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/vb1lsjcds1qs4e6tp1u3io8ck7/10625235827.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/jetizanoxenomunitetelokeg.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/fofukunewusovajipusuz.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/kipalajububuzixi.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/97240185676.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lozusuxuvowawem.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c9b1252f---kekadibab.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/63456957254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=donald+ervin+knuthPDF 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_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 20536 bytes
SHA-256: 67b35724df8207d091a3fa29f404500a0435959742ae40e61a5aa11fa86b3fbb
font_01_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15882 2360 bytes
SHA-256: 1836d0e00b9eb5c338b1595299afe962b37b584ceb41663787d3ecb61d8ad20e
font_03_sfnt_off000162da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DA 10436 bytes
SHA-256: c92df8d2b779fe7b4e1ad6ecab7c04ed691baffd7d3f5278dfc54d4093cf3c40

Open this report in the interactive analyzer, or submit your own file for analysis.