Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ddcec2f1b16f90…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 15:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a9da95280393b6026f55aa6136453f4 SHA-1: 838a273d07f75675de9f8f5e77039dfe2954b791 SHA-256: 24ddcec2f1b16f90894736de5507bd884001092b3826934e1b4e866d48f2f8b9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://neoclassicalmansions.com/uplds/file/fifipufoxowed.pdf In PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/dunojiz.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/99426553225.pdfIn PDF document text
    • http://kelsenator.com/userimages/jawopilevudogob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8889e704b---79466305167.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/94910179023.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210913164735_1771077039.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/45325050720.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e3356d5e---9872715322.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/25312402592.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/19307696392.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/53753223571.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/2340877722.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef41a286e0---62959230435.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/lasodoridazinakemobupod.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/72181931423.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/gelegojuka.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/64836607554.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/puxenitinuvawaraxutusat.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/vozefajomekojekexoborigi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/fafuguvazefenimoxojor.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b0050bd---74524600432.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/zugesigoduxaxivupi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369aa02a20f---40419150642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+hotspot+password+for+my+phonePDF 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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10912 bytes
SHA-256: 8a6f6e535aacd016fc5d38f03ef512f7c67885e2f08383688e5e97c05551d9a5
font_01_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 18304 bytes
SHA-256: ff1510f8a9ca7a4e216a4adc37c9a5ab7d26c9d6998db4268fa59d70cf75cf27