Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e33e23f77f290d4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 01:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1467eae85cc4768e968da0dc8d1f4881 SHA-1: 20784e622d02ef78af82d468f362b683b16ed5e8 SHA-256: 1e33e23f77f290d41002211b990c0767c06cfcb3bb348a6b336022dd1f7b72bf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=jasper+jones+free+pdf PDF link annotation
    • https://secolink.sk/userfiles/file/lagebojijiturelevog.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/14449606910.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/ruweworivofitetoluma.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/1561818345.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/5009323432.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/vovuvolojajegewi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/869c16e9a579795c0ed9b87c5eb6b99f/narolebugejokaxegutiliv.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/35074084036.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/53693078296.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6a6d1d4e599720f83b953d1cc9c5c666/90361409950.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/fibazixewavabixedezojemox.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8f456689---misagafizagu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/89156622421.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109030002483857.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140420ea886d---nudezimuzowek.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fupemumemiwoxevemojix.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/26500800585.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/sojavejasebogim.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/68756961702.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/34211873688.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/niliwaviwimuf.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/zasaberozofobikuwiva.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/39828686853.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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 17588 bytes
SHA-256: eadaee41f4c0fefc8137e112255f3d007a090942ea9cd7999ed96697115ae5e3
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 10376 bytes
SHA-256: cdf4dbd8ac8abfb0b1e9d7ef115a8cc4f2d423d0ba64b96c9b67a0df5a1a9989

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