Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1728a5f0a58b8d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 21:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7b8ff945b2f16dce2c4ff7b01f43603 SHA-1: 02cd052b03d03caed5bcc75e03a890a76126ad22 SHA-256: 5d1728a5f0a58b8dea3ff14b18b7af0e2cec8addeb1fc215f5a5d9849f05f64c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some pointing to compromised CMS uploads, suggests the PDF is designed to lure users to malicious content or download further payloads. The primary attack pattern involves using the PDF as a delivery mechanism, likely via spearphishing, to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/531570322ccacb15d852716bdbe87eaa/nufebapagiluwotekiwakux.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d45f56291---givabadegudame.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210908_BAFE19EAE9E3EE97.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mapojutu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/22964423651.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/gupajozusil.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905142359182407.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/togiguzemagefula.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/42307242992.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/22490381097.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210901_8F6E4013A532A713.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/pezirive.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/75739622040.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tiwifib.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/4198515542.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/73715543187.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/pavufedixirotoj.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/94533404515.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adc225cedd---rolasimefiwesun.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/19449525116.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/sijulutokovafipaderom.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/47745053367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=indomitus+book+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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 17512 bytes
SHA-256: a0830f2dbf942774bab9704889a7346811b4760d28f4622cc793224de50f4f67
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 10500 bytes
SHA-256: 577fc55cd8064e8d9b7061e126a5585284b358e5283fa0beace3c4109c7c0f4c

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