Malicious PDF — malware analysis report

Static analysis result for SHA-256 339a308e5c3c96a0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 06:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ad834bd9a9c738cf87ef41c8ec99596 SHA-1: 377cc9d22c3c59801877f198381227ad18c216f6 SHA-256: 339a308e5c3c96a0166c3ab2a6c51ea4aa605f91babbfa9037d687e9368d51ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm indicates a strong likelihood of directing users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.binghan.my/userfiles/file/41323863417.pdf In PDF document text
    • http://hanasushimenifee.com/uploads/files/zelaf.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://cesishotel.com/res/wysiwyg/file/77508581161.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a258c1d496b874bb8d5bde0e6e9ddb73/8181443039.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f71179018d7---225878044.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/95c5d202e8ce59d64c93c2a40ec1c9a6/18325707197.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/cd5682f67f8fc75af867137bb1c891e2/jevesixonobevo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/4077858697.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/tukizolidofetomumelelez.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b618fc6064be3e30ebd1d8fcfb0af5aa/26068767773.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/46767301073.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8g9j4e92g5ndd6o820euqgfq23/bibudapebetalu.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/nedumur.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210722_194353.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4938723c3ff0cbf8e4195b3160ae7240/rirexosi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fvn0qc3ehkvjnvq3jof0a7geuh/98276334584.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee58a922c5---9625025299.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/63758029195.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/61649304309.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3471a686bb---56235286940.pdfIn PDF document text
    • http://yilip.net/userData/board/file/fuvus.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076459e0460c---pubonikasibab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=morphology+pdf+englishPDF 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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 17856 bytes
SHA-256: be219951579f9b9ae2f50cab8b64f815b0e94f32bbcf3d7eef8767c138c97ccf
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 10624 bytes
SHA-256: ec7760ac51d1a589a355ebad65c2933fb43d2c8a1e147448468bf8f8608b9933