Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10d4387f6abc568…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 00:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7ae046b67a02a4bef98e1cd0158a681 SHA-1: c3f4dd1d9252c4fd1c06b19b32394725d6cce4b7 SHA-256: b10d4387f6abc568b0c1595ccaa0ab74bf3f41abde7fd2d03913a5de67a7d84a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites. The presence of numerous links, including one with a 'utm_term' parameter suggesting a lure, supports the attack pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/76318c4b72037b6cf263f76aba79f3eb/71365537695.pdf In PDF document text
    • http://villapellegrino.it/userfiles/files/9144007745.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/dujap.pdfIn PDF document text
    • http://15881588.com/ckupload/files/wunuforamivizipidadunofik.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/xatekovikip.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/gomaluji.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/11536917654.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/jufojibakakijajewi.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/29896773063.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/25433122298.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6ec60ae9---38071839764.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/85321103620.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60322212937.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/27fe771a73560a4c50873f91a3093366/92299185740.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/panisolo.pdfIn PDF document text
    • https://85097781.com/upload/files/xuwemolomuvekuxasixono.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/gilosenijomijurajejes.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5d2582f8b---balediguvevubijonotuv.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/kojabep.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/bevepe.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/witewusafimawojirasibafit.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/87496579384.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081719482214.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/tagud.pdfIn PDF document text
    • http://susutour.com/userfile/file/jupimilobuvoragewavunirod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+conjuring+3+full+movie+123moviesPDF 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_off0000b024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 11124 bytes
SHA-256: 4ecfce8a8919184bb104d18d93bc1aa8420171a5ce4514d97181f0bbe101185d
font_01_sfnt_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 14964 bytes
SHA-256: 6affe5a1dee6cb135a4bb9b4be160c224e6a0a1dad2150d4316bdc6083fbe78c
font_02_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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