Malicious PDF — malware analysis report

Static analysis result for SHA-256 55afb5da7a60b799…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 07:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 461a137a9be6f2ea79aac737f445d937 SHA-1: 3454cf245bb24c45d356d7c6dbb6efe941d6e1c0 SHA-256: 55afb5da7a60b799be06301cb8ab1d3faaa4275424623a2546d4d9b01af63a9b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as a malicious PDF by ClamAV, and static analysis reveals it functions as a link farm. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF's structure and the presence of multiple external links strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://douzonebnf.com/upload/file///80923682866.pdf In PDF document text
    • http://sxcec.org/userfiles/file/fizovokiwemufera.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/63751210914.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ae6981e8---sojolumojonet.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68b57476b---logovidiroz.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85670393251.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c20af3dd2---kelidasitisakurigare.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efef62cb2---dodirinajekejudenijire.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/83658195391.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/38764202282.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/zagif.pdfIn PDF document text
    • http://mopron.ru/upload/files/25835669748.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/bc9utp72nhvs2bob10fl84j74l/nidefurofovoviregetila.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/1301234018.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac589cebc---sagisamukuwiwotajutudobo.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/46497336850.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/vawipaju.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/61133548132.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/fe97bde6255108909c509118963ebd09/50258770210.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0ths9c2u5jntnnc207do4ko6qk/temixatuvulid.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612911d5f2b08---3561127747.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbdn80o6b0gliod8setehe1rff/83611671527.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/78763041162.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/19399117308.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7910ce39c567edc5e3f5aacc4dadd287/midisusakuf.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/domulumokutifalup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jaap+sahib+path+in+english+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 19012 bytes
SHA-256: bf5e970591f2f4742f3ee8d489eaf7eb5dae499b0a26b570e4c72660ea9b0732
font_01_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 10688 bytes
SHA-256: 79477f51dd26054013635ff1d67aa6f7a3bae7eadb0afce09caa583a4f75ee41