Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff5d3d8d9cca18c…

MALICIOUS

PDF

154.6 KB Created: 2021-06-10 06:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80e64319adc929061bace39b0c8688b4 SHA-1: 616f071fce6ddf5443577ed868762e600f888439 SHA-256: 6ff5d3d8d9cca18c6de00defe4cbeb3dcc1cfb17209502534b2b03e118caa6c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://krisoc.ru/uplcv?utm_term=download+drake+more+life+zip PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1537eaa00c4234e4f127d4a44a66f67f/36956537230.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d40e48c0---94374896106.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b00dc7e1278---34595958401.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nhmipl7jjc1n3ql9iq2p0bdkb1/1954251952.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/pidowujegiruz.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/21d53324d72a3942b905f56040155c8c/nifamupifubaz.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rotisab.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/50138726541.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f3be416b---81228875661.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4f1e47ad---powola.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/98635778698.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/litusinuvi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/44322406800.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d275194---58009590139.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3300e2018b---tukumiratoxirotomekeven.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056bb732c9---wevafonixavoxinaj.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608eba8a9d6e9---84224290984.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cd61b754c9a98c107f2095aff0633be9/rixesija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFBA 4920 bytes
SHA-256: 9f403305ee610bd5929724a05637721f471bdd4d80255ce25e1922e7cae17202
font_01_sfnt_off0001f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F069 7608 bytes
SHA-256: c5fba6847e18424739417940211a8e87ead2b4fd40a218681d0dae1486a3f37c
font_02_sfnt_off00020a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A9B 12480 bytes
SHA-256: 7ed8b91f959b2c3fefab065e9c8faec9210041c4ec3792bafcef295b6d5c474c
font_03_sfnt_off00023528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23528 17180 bytes
SHA-256: ba42d971c0943bce8c2c62583587009bb7bae5b0e5964dd0660e92201b3faf07
font_04_sfnt_off00024e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E09 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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