Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9075dc935d359e6…

MALICIOUS

PDF

73.0 KB Created: 2021-07-25 18:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e75b56d89acbab614cab4bf4f14e364f SHA-1: 4cf1bce2553f273321ae0d2a0ddf013e7ac1ce07 SHA-256: f9075dc935d359e6db1e69d0fb60332657e038c3405ee775f040bac5367d5c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://immobilieninvestors.eu/userfiles/file/widuxuvuratesig.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ltt6fuvl4u05com7vc5hlivs02/92479504794.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/6122608705.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d0e644138---44498017463.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/wapewepa.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/paduganapuvomalanegez.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/berojijagibafobuve.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/xegub.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/vovafanosudojusekow.pdfIn PDF document text
    • http://alptw.com/images/files/babisigut.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/53806117664.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/efaf93641d019750e08540f50ca0cd3f/xumaran.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/39f6985a09145a3d91f8f972b7c66197/kotenaputuvaxuxabom.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5e7955d08bdd4708630659a1261b7ca9/86507487617.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/37f9ba9730e410573e4e5135f0511b91/62284812307.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/3586165960.pdfIn PDF document text
    • http://banquat.com/userfiles/files/35426184000.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mibazesusolinezudak.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e80ed00ebe---44656984472.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3f071df38---67875196581.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nexegibawaxajepufirew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=escudo+bar%C3%A7a+pngPDF 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_off0000bbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFB 10740 bytes
SHA-256: 111570d17a9e4721afb8428d7d8994b89f91a91880311c5c9b1ae68de64e8f6e
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 16200 bytes
SHA-256: e0e80ad867ad1363774d4de0c47fa946fe57d4c5bfb521625db2d81d34cc43c1

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