Malicious PDF — malware analysis report

Static analysis result for SHA-256 65840c88c02c0fbd…

MALICIOUS

PDF

115.2 KB Created: 2021-09-02 15:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db51686cfb526643691fc0d00ebec848 SHA-1: 649df0d822e8d10fd0b6b383c1aa76ece604504d SHA-256: 65840c88c02c0fbd92691933120006546406673f92cb655a6785227ea5ce32c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF format often leverages JavaScript for malicious actions, and the presence of external links supports the attack pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842fcdc6e8d---33056950436.pdf In PDF document text
    • http://gfb.it/upload/fck/file/76534734556.pdfIn PDF document text
    • http://rjt1.org/upload/files/73944939191.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/de981aee8a5a36c069937b8b37b5f8d6/zulobugax.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f98d3f79f---todozawupoxabafuluberapef.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/pibuwilivawisinadi.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/mufikedewagozefidanoze.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f8r378r55hlmnloro7ed2hkdrc/43917412708.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vc3uno7g7bbhhgl34ijtqmr2k7/muvajakevazobikabova.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/nenutupalawukalawufovo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e534272b2---49830727596.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/271697c0835f7fc1b31ee5d55288abf7/31221998197.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kofozapabab.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/99939228986.pdfIn PDF document text
    • http://elitvorota.ru/f/file/95283387372.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewumubanofolivalikaruf.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xanutaligolaj.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/68661023869.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-2/20210702131424161697.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ac3308874010a8f4837fc07ec28e392/xuvifodeb.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/31e055102a6a0747be606b1a09041d91/35477148463.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/nuvulejelozivadejisimogik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=condillac+treatise+on+sensations+pdfPDF 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_off0001575e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F75 10644 bytes
SHA-256: e81b03f76f28ca6fee0dd4be053c5a2d56b59f7965fe3e34392db58dfde34156
font_02_sfnt_off000187f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F2 21352 bytes
SHA-256: 5c0367594c823263c9e901a3eb4c00ce4ffc100b5e17a8081d62ab1dee233e08

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