Malicious PDF — malware analysis report

Static analysis result for SHA-256 370e98c8ff507b1f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 17:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 668d514f4696f560891a4feeab20d477 SHA-1: 694e0c9f86a835092d121ef80925c209b92cf0c7 SHA-256: 370e98c8ff507b1fa58a675ad32895c4b5c893bc75084e17814731099b354782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly imply an intent to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c392d01ecb---77224166142.pdf In PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zijelakedes.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/23137547457.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/33828660781.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cbaff325f---43749794556.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d499e81f009---minutifomobanid.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/zorelegerodebime.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/85131465740.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/njn91jg3bk0a5fd6m7uq5mlgik/dodurirakubirosanumizatu.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/wofodenuwuretodur.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611e43f8b6521---nekigoxano.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/31189369315.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/36684688014.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9af08d7e4---wevonurobataz.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/39180855839.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/05d4064490b082395161263e2bdd7f66/polemiga.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zitasugureparadurafe.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef45c084c1---dojagomowaz.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609973bd50f1d---kovutatinavipuzinod.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/45417430829.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zejikuwonanatip.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/9926696792.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6d6d7f3b---rarele.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610e91f47478e---pokorilafufixawux.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4c25210f81a6ec9a4305edf05b694ea3/81776985491.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wewisaxibaxikatuwubovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=poilu+louis+barthas+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_off0000bb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 17548 bytes
SHA-256: 8ec51d8ce6c13ccc9bcd5d9c55165c2b1ded4fce8528f8b64e6ddd08603d11da
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 10600 bytes
SHA-256: e84ca1ec43f72855ff24824b13b45f9880e708a0f96520978a5f25d8f92af07e
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1