Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6006f34ad6d143d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 11:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d34a9854f4dfc200cc011a2eede87ad0 SHA-1: 76b55a70fcfebc896f7af4f1b658536a088db770 SHA-256: b6006f34ad6d143dc8bcc104b0e6309319aebf8d6ec142f018ce6a152eec8323
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs, many of which point to compromised WordPress sites. The presence of these links suggests the PDF is used to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59092bd35---57782518269.pdf In PDF document text
    • https://hogies.com/includes/template/uploads/file/pudusokegudeliteneweguj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb059877159---67168427268.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c13834eff22e3512e582147f89f8f14f/94409196048.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/07e1f3b9b49e4fe117c476b22c3c7674/lapewalezo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bufetotinagolava.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/skftv995fjrgjk4usaeij47udm/jesifobomeburigefaseni.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9e13450915dae3a3f1138efda0f7545a/tuwopum.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc65ea5f72---wowawe.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b16d06e7b35b99ca4c32cbcddb4b9a6f/wejevigiwuzurinupu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dcc28a2---24855978086.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607735053dbfb---foguwumejamovizabozul.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba79b8f9b---33588703613.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5038cfca6aa929dd61cab44a90df2755/4790577976.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/pevidafab.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/janosuw.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9hv8tpchm54tji2eucu4vdb124/51332610419.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/vusibajamunutimexojugut.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8d783af4---70712418634.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9adf90d1b0a7fe6a6fe688ce3b9f0e2/walezolugexukufafizipo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ddbd88a4854f83fc77644199d96b3c93/10244980936.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4f3e58547cebc803c2870b56657e99be/45137232372.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bb0c5ig3kq7aqq1fi5mrtet29c/71646147460.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/59fc36ccce1fb37106992e2409c89082/dizomefedomomanilokolotex.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07ec8b268---19221131827.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/40q174aijfje56k7egirp8l4u2/23529363969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sample+character+reference+in+resumePDF 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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10800 bytes
SHA-256: 4048a9f6328b4571d9e1eea3117e2b313796f1d68931bd258dba49dd57201ad3
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 17092 bytes
SHA-256: 82d5a59fbe5ccd7f7323979cabbc45221de58d35488e30204a8a5bf546e1ce7f
font_02_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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