Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d7a8970dd99795…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 16:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b89ea4cabc0a8f5a104033f69207d075 SHA-1: b1c234e6afd7eb885cfb8cf0ca2ae59642509c8a SHA-256: c7d7a8970dd99795e6173f90a2797a03fb08e18f8507fd19239b2cc0e7556126
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste commands into a shell, a common tactic to bypass initial execution restrictions and download further malicious content. The presence of numerous external URLs, some hosted on compromised CMS platforms, suggests an attempt to redirect the user to malicious sites or download payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://olympicburger1988.com/uploads/files/72258580946.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v1b12scd7o0agp6ou8uteopsal/sulexepokirefebetut.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13f37b3af---93536939306.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/zoxinepulazujovumi.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/mamopof.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/76546717518.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/84320314013.pdfIn PDF document text
    • http://rhondachem.com/d/files/34284148115.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/49528431271.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613121ede5a8f---99986505891.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zexaseka.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109080838219865.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/97643512560.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/65732841838.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/81452886166.pdfIn PDF document text
    • http://cissi.it/userfiles/files/pofarumo.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/1121616154.pdfIn PDF document text
    • http://azizolace.cz/images/file/merediropenopuvimonufogir.pdfIn PDF document text
    • http://homeopathyhk.com/files/xafuxobekituboxopoguno.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109111010456191.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/fivisetanog.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gotefamu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bowiwemomuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=windows+activator+for+8.1PDF 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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 10764 bytes
SHA-256: 5e1602607f2bcf69ea59b0c67b82b70194dc26bdd6f47fc0b1b1da1015619cbe
font_01_sfnt_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 17440 bytes
SHA-256: b19a4281d2f42057c451b5f1bb70e5190ad77e19512e6007a06196202e420a0d

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