Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd4f96478f76942…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 18:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb81f0de5509308922b04e45ae0986a7 SHA-1: 2ebb89a4951b7cf21bfeea5b37d6a4d9514ebcfe SHA-256: 9bd4f96478f769429bf3809ae0d383786f01346c11dac31af3b3ff2e759c3aa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of embedded JavaScript points to its use as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=pdf+to+word+converter+freeware+nitro PDF link annotation
    • http://cisseo.net/userfiles/files/semakuzasusakivovifoka.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/rawojosotijenovi.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/nixotipumogevajufekisekot.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/levibupakuvumomogojipida.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/nevokiseguk.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/mumebinebalofugalelu.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/suzogi.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/13931648867.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/81136676112.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b467b40---simiza.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/47203791471.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kusalate.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed595f1b2e---19062758712.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/muwovobeporuzedujaxug.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zesofotexuvuxajog.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/jeribepunotuwu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613190980d953---78622231553.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ke384e8nglo8bcgvuga2ebs449/peluweserajugaw.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/gajazudajafesufukuf.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613235560c13a---vizixorabupizujaluwol.pdfIn PDF document text
    • http://idroter.org/userfiles/files/49541324424.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/09r31qs21580t7nfa4ie4gacbj/kavomefowovubinetoge.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/lebudubazawat.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_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 10408 bytes
SHA-256: 2d6ced67fcf22dd76a4672ac8f5d5342ccd40e2aa3dce53ccbe9e0bfe16f2e28
font_02_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 17400 bytes
SHA-256: b89beb01246f7497bda978aa7eda232399355f612f884578103fbe550656943c

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