Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6f4178d1906c76…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 14:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc4a9971d8ea2fdcf545e4c584c6680b SHA-1: 373c833cd0cc504c2d3db1a150ef3c36003c56e3 SHA-256: 5f6f4178d1906c76b9ff4d91edb7d5df1b90c4dcd7ff64f1c90d5d5b9ad47f47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://luxesystem.site/js/ckfinder/userfiles/files/zorati.pdf In PDF document text
    • http://colafranceschi.it/userfiles/files/raxirowibetuzijo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c555d0db4ee---vegorawitekatenedew.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/96533740977.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64643347759.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b5e37b35---nirofemimozerix.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6id0d2i72002cuea2o52nmp3q9/nefogozegegudegafizowufuf.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/nukibepazipemuvasabijuvib.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/woxalezovujisajuzononu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/sujugemov.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/supakajuto.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/kotunetibodigidetasugipa.pdfIn PDF document text
    • http://wych123.com/upload/files/xaposar.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/5070136400.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/eudhtkiqf2n655dri37krh472u/66170649529.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/rojovupuselofewon.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/83082061867.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/rugikimidefazerojekod.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27b5be5bc7c4af5d8d3c29064a4b57b3/11083363833.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/24e38c7af500498a1cc989e4a036983d/89735924289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=subtracting+mixed+numbers+with+unlike+denominators+and+regrouping+worksheetsPDF 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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 16644 bytes
SHA-256: b9a48796c7ca3ecba3a08f53004c6978e96725c11346ca3f693c1e725e1442e6
font_01_sfnt_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 11556 bytes
SHA-256: 87145e23518eac185438ea486b2f644ff96c4051c6b24e5b1af2ad36d754e622
font_02_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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