Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd475e6e46e6447…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 08:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3e2d6edd5df8a84dea075d045eb427d8 SHA-1: 8c7b5968fcc9a88c584656125f8c38be5130a094 SHA-256: fdd475e6e46e644785ce97ecbbda166f425fb3636a09f2fdbf2a44a6c28d5521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://catamma.ru/uplcv?utm_term=we+shall+be+changed+in+the+twinkling+of+an+eye PDF link annotation
    • http://ingenermarket.ru/userfiles/regatadabawisogejivisu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c9dc20a8f1f9d321ff5afdf22445233d/65314284463.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/67f324b0033a0307ce4e0a2917a82c7d/3196686943.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4ff5bjf8aa19o02869ithv8ck3/63525888079.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/jerorezaduviruxuvufutedud.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9780f8c2f666222bf1bc07b08d2a1f88/17197793492.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/temurezolek.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/60914567627.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/zewefuvevosovikagikijan.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/6539670437.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087235c95ec1---puvusefedubarewosuvamilag.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/36953797017.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/74356538143.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/kugofesizagiwobarixu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tpilftrombddqvprj85qupe6h6/tuzozabamepijopum.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/92726799426.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/47218736540.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ab49a394---51383815664.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/jupusotedanifurulinokode.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/81378276161.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/29653067880.pdfIn PDF document text
    • 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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 11080 bytes
SHA-256: 56d2ce456a31c5e3de15c8d063e0b810c0d69244fd9f028e7a9c1610a80effdc
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 18408 bytes
SHA-256: afa9d967e89451201ab9013ca87a355f42f3c9bc6061f8927f4bf5e91da17e89
font_02_sfnt_off00012ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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