Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3732ba28f30bfab…

MALICIOUS

PDF

95.0 KB Created: 2021-07-23 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f502317da58de8c64c865de5299488ab SHA-1: 280cde9147c57d66d143ace387a50f4dbc23cc78 SHA-256: d3732ba28f30bfab0d42a7691e79c5d4ee1419130516fad526f5b3a3cbe55cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://webhosting4.net/media/file/21939307406.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5676042a---vugalekafuzajidibapa.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9e1501710e79d3b03de98f882ca475f4/21267019095.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/0kdab81hkvkk6dhm722o41plqo/66074866075.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/habg9a2leq0jrsashovl5ob1lm/vozumumaga.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b226410639---xebazexitafeduda.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/56073096424.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078776243ad5---34999283897.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/76922752617.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/dfa70c033efd68e95da175672d4be13e/wagexuxuwefivelig.pdfIn PDF document text
    • http://ahchala.com/img/file/digeroxude.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f7e68fd3bf602b59c60ca7391a361b19/59334131584.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/vikodurika.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pojotufanexol.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608446b0ae749---97631353461.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6gj1aq9sdmt55ooa3ilvouf9as/15623356351.pdfIn PDF document text
    • https://olterus.info/contents//files/34532467397.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/melejiredobogorar.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/94aa93e9693dd5a662a7d59a239429c7/lifulobipafajulo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2ef169e6b26b1f5177fcb5301958a010/ginozefopekedojozepebomuw.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fb79afb9---21581506470.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf9e38aa50---30132981624.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4a1b95bb92db3b8e44a5b481e767354b/vesuloxitufov.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/lawavepesanonizowoxega.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/rolalupujinofodukovirixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=template+cover+proposalPDF 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_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 17392 bytes
SHA-256: d6a5eafb34c3950b56a4378800a1fe9090e2c844761f4f770e3980e2737eb09c
font_01_sfnt_off00013de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE1 10368 bytes
SHA-256: a4bcba6d19393839d1624d1ad6cb7c7538a046ef86cb1aba4e251dc7f6d320f1
font_02_sfnt_off0001556c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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