Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fcfdaf8bc1c3d1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 21:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0dcce55a10160adb0499bf88ebe51f2 SHA-1: fb1def51ce9108043c4fa4bb3d2e061feb754261 SHA-256: 85fcfdaf8bc1c3d1e0e5619f1eb671cbeb753c2d5777d1ab35a976e2c0d929ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://facyt.com.ar/ckfinder/userfiles/files/87666991597.pdf In PDF document text
    • http://tonghuichem.com/upload/files/fopibozo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///xexapatagenosit.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d388013---31312452259.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/bukomisokar.pdfIn PDF document text
    • https://dcimx.com/files/28392405569.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfc705608---87789146858.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pigubimufetamifak.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/koretuda.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987a600690---duwekalame.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/vekutidi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdb5df523---97559091942.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210902082903.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/56720828374.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131b42a41029---wizewenivikujezoxireg.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/75960448355.pdfIn PDF document text
    • https://windscrm.net/files/file/wumirisu.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/xujesuliromezinate.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dlol8juk05sfa8m8t1gsvlmhma/fuvixukuv.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/parimadule.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/844fef44503addbfe1a883c3bfc072dd/rotokuge.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/53148089964.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210901183450.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pebakokexupef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dead+target+2+downloadPDF 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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 17488 bytes
SHA-256: d63c877f68eb68fb65aa6f8c20dd98f1b437087a14368172ce06645afa1a6975
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 10372 bytes
SHA-256: fac74e56b0115b309ec3d49e695a721cae9025ed9a39aa6074a29695a5b5f608