Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f578183bc30ccd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 14:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7db421c104220b050b5745bee0f951cc SHA-1: ba2f782b0344fdc6dd9be77490d824368d758a35 SHA-256: c9f578183bc30ccd922d616cea25b8fe58d934b23b7db3442303a8cb750a0373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which appear to be on compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=moot+court+problems+pdf PDF link annotation
    • https://specializedfacilitymgt.com/public_html/userfiles/file/xufidawufonamosaxalitiw.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/97923842704.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/pezikisigodojowikekafa.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/96288626064.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901120025996376dk1cs40sb0gw.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/24fbb51675c908f69839dffdecb71b77/dupubewitedapexawafike.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/30634702120.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/78652210497.pdfIn PDF document text
    • https://ysh.my/userfiles/file/2511648115.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/23459520346.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dugoxidonojozeg.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pazifazozota.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/popobulatuzunitonases.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b01d4596---74938881050.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/811171013.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/70249841758.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zuxodomosexelal.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/rowowadov.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/90806624851.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/92221731449.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/fazixosagoranovejupim.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161386b3d5d53c---57517622725.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ee441c8f---73222096421.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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 18540 bytes
SHA-256: a8ff608e67b30f28c2515125b3095221388d6753f73e116e5126b8afdf407496
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10656 bytes
SHA-256: d8079b235ee860418dba9817cf27e572698501b0fa3e28bbe4e11acc36a1cb3e
font_02_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1