Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4e7a410b2eaa49…

MALICIOUS

PDF

107.0 KB Created: 2021-07-04 03:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 879c65fedfceacc33a5b3f74cdfbf3cd SHA-1: b452c4bc20cde9e99a393b49f6dd58829969a540 SHA-256: bc4e7a410b2eaa498d02ed72853532651e1f1d4d59e76d98d765769da1235dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d7865a309cab63696684c2fbeb78fc0b/pegegitakowomatusijere.pdf In PDF document text
    • http://ltptech.vn/uploads/userfiles/file/25056941677.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/64043567325.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d48ec47d1---13820529325.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65e13a1f4a---jotekukezetikuxunijekexi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e5sej9d87sl98q3090lbhpuqru/70396939437.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/63908993405.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0019f864---71738757948.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/sedilitoko.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89bda484ee379de75aea1044d51b2361/suvedejovebaso.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/af8e4f4dc6833f8a9564aeafe196a5aa/21554591201.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jigejexemarafaj.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e4d1cbb0358c95b8730a3d4ddc10871b/wewofajulilexuvuga.pdfIn PDF document text
    • https://businesslife.com/content/file/batefububetupiroweg.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc737e530---fojadiwotogikikogowesog.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b240ed5f9d---11541313361.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/evbmd7k4jqe7ldma0nndt8gtsa/55792479127.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/73725764330.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/bugalekudozuro.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624762847.pdfIn PDF document text
    • http://hydrem.ru/images/file/rogakapazifupur.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb33a4dd4---89515098214.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98594667b---10339097537.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fe282008---37434954959.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/54a2aaf69f142b6003cee1272765eb52/57040125791.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a061ee77---pulevutora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=grew+up+way+too+fast+and+now+there%27s+nothing+to+believe+lyricsPDF 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_off00014067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 16504 bytes
SHA-256: 464faff3108ae8aef1ea1520750945e0b9a4c304ac872e3ef108512b50406e48
font_01_sfnt_off00016b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B25 11480 bytes
SHA-256: 4fecaa528bcb7a1d2c04ce2e75fd204f73036c6ee92214d67016fe56b86edcbc
font_02_sfnt_off000185f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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