Malicious PDF — malware analysis report

Static analysis result for SHA-256 d724f3f13aa8d214…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 14:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1565b553a4fbea43a6b109a37b68fdcd SHA-1: c7a35e21eb92db81a72c4068c9c0669b03d65e81 SHA-256: d724f3f13aa8d21481fef615697001cff45a83a7c5025cee18b22dfea1353274
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the nature of the URLs suggest it is designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://muslimofwestbengal.com/mwb/editor_upload/files/98588435700.pdf In PDF document text
    • http://thietbiotoviet.com/Images_upload/files/84072737702.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/14221496785.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/109e4cd1d3b824e7f85770f56df54914/rikek.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/lp0nu3kkrebqc1pms45lmf4p4v/regumo.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/tufepeto.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/kofifunos.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5abdfc6000---migujutewite.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f374cbdf0afce53d29973c47a970dbb8/47002623217.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cn513efeb3rr2mmujtrrm8o8tp/kafufobopeporixepokolagof.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd56c54aa---bodewenubowomasarovomimel.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/71043922134.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437c485f61---39990254521.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/7807888459.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/65010232307.pdfIn PDF document text
    • https://autoskola-scp.com/files/65642639271.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/26351355723.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95afa6cd26---50096669975.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefbc6ef59---43160237101.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/dufir.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/73262518605.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/29736917481.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jalejubexasabivemodijo.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/jutoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=adobe+premiere+pro+shortcuts+windows+pdfPDF 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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16360 bytes
SHA-256: 564c4fcc53840b34bda682339faa60c4583bd4119932fd34bd9b51849e840429
font_01_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 10984 bytes
SHA-256: 9def1980f973ebd5d1419be1fd303714ea945a3c43768fffb855218723f950ae
font_02_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1