Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ffca7267c3d956…

MALICIOUS

PDF

106.1 KB Created: 2021-07-25 09:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89c70670da637ef1ff911ccc06969214 SHA-1: f75b9c469b5de601cfe0aaaa8f4317af784e73da SHA-256: 31ffca7267c3d956ec2bdc9fe312368168932f16ec324583f6e8be14f7153c5c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/babe55072b437d6e03f48dcc0e787a40/dulelobasafanofesebujegus.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gidep2ndj89206rpeca4j5ehqc/geduvugevalidizo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4363ac51b---81387332194.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077da4876520---potimekimesujafibuduwexuk.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/pogasazovuxilegav.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/79fb6ba5ec2603930bf3ddf0f35586c6/paganifi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/22901261613.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/afd0bcf206b33c717feeb21d3fb09d7c/vanonelikujagezimofaximil.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce87ec65b---lefipimajewux.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7278956c---36312458569.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/virexu.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/9371971819.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/50760676553.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/50414313207.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/saneziwigixamawotokewuti.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5ujr0qs6efo7s59qi6epnt0e13/69848684979.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/29171619341.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086adcc26126---27747415518.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ahraupm2s022s9mb113a3m311r/tavimob.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/baxivenasilebobanepe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55af7cadc---85036364737.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796bfd6b42c---teramidomu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fb487e924ceb489f3bc926ef9e61cb10/lojajobari.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b240c8c---xiwuvozabami.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbddfa2c74c---vatufututonawuvewadinonid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pied+beauty+poemPDF 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_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 18824 bytes
SHA-256: f72b3145c25dc1756e15c84e6d85c41f4e6b0d52d014398b82cf452f5e87f1e2
font_01_sfnt_off00016b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000183a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A7 10492 bytes
SHA-256: a16048cfeceee36085a04d64193ae8d701c151114958b06ab6b567b890acca79