Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b36cfd12dd677e2…

MALICIOUS

PDF

113.5 KB Created: 2021-06-18 23:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 03d353174fdb1bed473846166280610a SHA-1: 468288b166a74599e647f88af9162d6292428aed SHA-256: 3b36cfd12dd677e2e006d668c678fd1a46945d364208ab5011e295d44c22d80a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The embedded content, though heavily obfuscated, appears to be related to the 'Hanuman chalisa gulshan kumar voice' search term, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7891

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=hanuman+chalisa+gulshan+kumar+voice PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c824d6bf---vegajedimusisivun.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2aca236d---jimiwojateganodabewutetes.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rmn6metcduqsaqhqde9t323qmg/58814366391.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815ce2838dd---99064056323.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/91256714669.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7dfc1fb1---gotif.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/25504994768.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/12la9hi46fq3eusqcps7697hr5/faruj.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ee5f51da960ffb68e86d562d31f8c792/4517515956.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/tedakijolixipujobiratopat.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/30980714614.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/92005733248.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/lunajiponasa.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/vagevuremebebaxera.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a185fa110a3---81676973556.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/726bd58f21e01ec761ed65e2cf4bc1ad/nipepizafox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB9 5300 bytes
SHA-256: a9259743acf2050300257999c91623c2ed36fdb3a1b75a7aba3e74ae0143ed14
font_01_sfnt_off00018e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E91 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off00019a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A35 13148 bytes
SHA-256: 776c750ae2077e749060b0f48090a05d5bac5873474527ca75b248823d241683

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