Malicious PDF — malware analysis report

Static analysis result for SHA-256 a712c4a67981e153…

MALICIOUS

PDF

86.9 KB Created: 2021-10-29 23:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5fdb0d35cdeb707026317d3d02daf9a6 SHA-1: 10ff1593b64bec6330d0dcc2f9d1fee8d6999e3f SHA-256: a712c4a67981e153cee9fda0642dec36bfc2487750f9badee2f11ae5598f3b7d
172 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and links to compromised websites. The presence of a 'download button' lure suggests an attempt to trick the user into executing a payload. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/53899893286.pdf In PDF document text
    • https://iskoruma.com/upload/ckfinder/files/tetepijisimabuloxe.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/wiwomelurifoduxemoropuz.pdfIn PDF document text
    • https://mimpishio.com/contents/files/63377140386.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/92607119943.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/kebumatosiloxuw.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/kuzukewuzuwunuju.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/20457137278.pdfIn PDF document text
    • http://strandedtattoo.net/file/65735381786.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e7f36e15e5---79094494118.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16161cb36de694---53813834370.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/kipumilivorebi.pdfIn PDF document text
    • http://3m18.com/images/editor/files/48462983760.pdfIn PDF document text
    • http://webmanagement.colortown.ro/images/file/texazoma.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/setubugiwo.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/31046679306.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210918021817.pdfIn PDF document text
    • https://fultoys.com/userfiles/zojujaxijuga.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///37470166619.pdfIn PDF document text
    • https://nexapos.com/upload/files/49767901817.pdfIn PDF document text
    • http://nepalimodelagency.com/userfiles/file/nakadarajomodenazin.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616cd70e19eb6---96577001562.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/26309360030.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16176a6aba4d41---84196512308.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/lobebefuzil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=pdf+to+excel+convaterPDF 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_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 10376 bytes
SHA-256: 789b42f322a1b2e5e6a406e2212107dc0c706dcaac88eff5ea009ee27fa9abc3
font_02_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 17732 bytes
SHA-256: cba6add059ff1cc4a5a0338742551915ecb2c9f77b44028e3aa3c961a45b3e69

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