Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6ba05ee18d4487…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 02:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8010929eb26834f3f5aefa9d228ef411 SHA-1: e3de66dd473934a4dde031830a7fdf0d756c7ca3 SHA-256: 1f6ba05ee18d4487d9b063c8567ade01f1b0f67fc2eab71089756672ba77ccb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further suggests malicious intent by leveraging compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=langstroth+beehive+plans+pdf PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612a946c58880---tuvulejepoliden.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vewezuzokewozudafomuj.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/2547087372.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/15148480542.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xegobulikedijeto.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/melaxuruna.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kekosinerugari.pdfIn PDF document text
    • http://proxima-design.cz/files/file/55879149145.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kasivafofafukivegatidag.pdfIn PDF document text
    • https://roc.mn/uploads/files/naxefok.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/926536v7n7vks0e4rf34i5a5qf/80075194519.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ff6fabc3c42cd01ade312fe49ca211aa/26573351573.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae51bffa0---89337699145.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703eae1db82---dizizodapexuxanipu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/79a26106244f727200f8a8576d971978/jijaget.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/89465895254.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/ruwamatujaxexikesip.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/zineturafolomutol.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d95ef18a4---78401646597.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuxorokekolegu.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/37200390412.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdfIn PDF document text
    • http://usagimatur.com/files/others/vidimurutafixefadovudoro.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6b4ec134a4d23dca8e016f0157784b7b/65077672735.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/66827611886.pdfIn PDF document text
    • 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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10940 bytes
SHA-256: 862324f9d58cc094e4ea44d54f20315df0db415d90666eb0d157d64afe71095a
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 18212 bytes
SHA-256: b5f7fefc184bf0a7dc9d63104925bf93737425054f399adc40093ea92f59febd

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