Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff448ffe2a5437d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 01:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25c35bb933fc8532090e6ffe0fd6bc49 SHA-1: c5b78a6a4a6e361af765e0169e711aa53d3a1186 SHA-256: bff448ffe2a5437de639fba67ebbf7ae4b21d8ccc2556c7b9e1bf988bc8f0999
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in a URI and the ML classifier's high confidence score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=dragon+ball+z+kai+filler+episodes PDF link annotation
    • http://tobn56.com/UpFiles/file/78610900219.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/suravitisajo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613587cc81e61---gulezovutabegezivuxuvad.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/82622388675.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/3921612131.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/36802353021.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/jifinufoforumewewo.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/wujitoxepezexowininijelan.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/jerevevi.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/fetobabadevisazekujujop.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/21944551631.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912111236598242.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d54025c---10621562845.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090404144272.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/wobojazo.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109100155181641.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/finonerebi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/38827542713.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/zareginibivotux.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12504573068.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3d3e3bf---79883104010.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/28350033149.pdfIn PDF document text
    • http://taigesw.com/upload/files/laseva.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zajutexepekume.pdfPDF link annotation
    • http://140.121.125.49/ckfinder/userfiles/files/20210905_155431.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/papemeviv.pdfIn PDF document text
    • 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 10868 bytes
SHA-256: 36eb0a7269126232ed8379d08c79754a7d159722fa65bcbe276389bb70c37dec
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 18584 bytes
SHA-256: 5d498f1726d3d37362c8234cffc4826a60de83d03bc0cca7f65cf97dce1a7bd5
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1