Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d90d4d0cabc0f4…

MALICIOUS

PDF

79.6 KB Created: 2021-07-17 06:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76b684c6809359a9a0ee94addd4e361d SHA-1: dbabf54d38f22e6136ec6558d6a5f322d22f9d83 SHA-256: 35d90d4d0cabc0f477e953b9cabdb34bd14de652f22af83bdfce4a95cfde2c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links and the heuristic findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b801dae8d3e---60715826674.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/91a9ac2d63db7cf1e8614167f7b76622/zaduvop.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/sozulodexu.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/82214227572.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/7381079717.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42460195785.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/25709435633.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/jometebisuwerese.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/latejagujuvixedoganis.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/41ermf6v6rgtsg34pk4bftb2cm/vimuruwa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750916bb077---6271671124.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/66712398261.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b8a99b5e---vamotazaluzakotu.pdfIn PDF document text
    • https://123natura.com/stockages/files/jurakigekamid.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061912221373499.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/dofasefi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5a9e0072088ea308c1812d27ed0c016a/wurulasemovoso.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/10fba864a874f69a1f36d198df63a568/11302622613.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d469359e3---48631001503.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/81645248267.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tapopuvudak.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rinmhjks0bpcabic75qqjpbirk/14133578050.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zotukugu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/50369266660.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/22db3055a56eeece4b8077d9e9e05f88/miwaruzewevefudurez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=backpackers+by+the+bayPDF 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_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 17448 bytes
SHA-256: 79c54067b4352b78cafb45cb082ad48736885922ceca91e3cfbb5142c7f2bda5
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 10508 bytes
SHA-256: 732a03107127660155deeb81c58c247eb4144a43de7f2c4bccc6384a475c9087

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