Malicious PDF — malware analysis report

Static analysis result for SHA-256 774eeef85a1aad7e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 18:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64c75c64a87158ef6a616ea81a165b44 SHA-1: 9bd9918b0eaffc587783f32b38e2d10dec5bbb80 SHA-256: 774eeef85a1aad7e103c11541eaa53f4df419eb7910f5bf1a3e5af7c0c364734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of external URIs and link farm heuristics, indicating a likely attempt to direct users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. The document body is unreadable, but the heuristics and numerous unknown URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://plenaseguroseprevidencia.com/fotosempresa/files/34162677715.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/nileiur1hnjc9fel1a0uv6l4j1/17029124936.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eaedf0f554cc986ec02fe0194bf60df8/pomajor.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/bapeked.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd633355e18---rimasazi.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/vatojexilafutumo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610de58000150---82996940447.pdfIn PDF document text
    • http://mosjob.ru/images/file/sufonitarojisukilade.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xipinasexaxivuxoti.pdfIn PDF document text
    • http://air-con.ru/upload/files/wenagotuwofoso.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/97328bb3a05f7635971a01a663d09e0b/wunez.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/pazubagubojapafumoganola.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/11271544683.pdfIn PDF document text
    • http://venkateshservices.com/uploads/wusam.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/norejagemibekalanixepo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/lebirufovo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/newuxadafeduvokawukapuzid.pdfIn PDF document text
    • http://renknh.com/ckupload/files/23854958397.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/4127107552.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rabejutixejidumu.pdfIn PDF document text
    • http://infunplastic.com/d/files/12507192106.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/wazabaxesoneba.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/magrhfaqborc7je0do0rsq1eom/vasixowu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607158b98c7a0---22673828224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=oxford+learner%27s+grammar+and+composition+4+answers+pdfPDF 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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 16132 bytes
SHA-256: f820d94399567132e813d27b1788e681e132540a7578f328c20d3a7b3eaf8dd8
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 11288 bytes
SHA-256: c17e28de022e2a5b08c694ab282a7aae101707bd8652b29cbe11fea19bc38398