Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdcb5ea51aaf568…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 08:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83162d458da70eb519d4b87b40fc7873 SHA-1: 6d11e79927468d02f3690b9d44244dab61324b0d SHA-256: ffdcb5ea51aaf568cd8f5237ac62123923b0cd60e5dc874cb9699869efa51742
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=how+many+long+term+relationships+does+the+average+person+have PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2b9d28d1d438f548e4f6b5b82d81fa4b/zafawogirovogidepum.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbca90537---kagabipamujapumegaz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb73de26b7---fazaj.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/5740854842.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d47dfad7da873db33686d4e58802fa35/sopuwadojumibosowajovefa.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/57434023820.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/73934368261.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ems7rgrq6d6ftlt02uifgksbli/22052663999.pdfIn PDF document text
    • http://446888.top/userfiles/file/64540098012.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083401c9087b.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2010da10---jisowekab.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f719a1fd6044e0ac547b41670f6deaca/50185300489.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fmkkdhgh4gpkb0f8kr5lrivdnf/2504962529.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/715573567.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210515162207.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/80497754523.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kcc1jgmt66i6d5ob4tc9k66gqo/86430847989.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/wuwovutovemejuk.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/3135733582.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dba664dbfe9---92323444704.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93884036524.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5df1e109---30587635574.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/bigipalenovajake.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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 16828 bytes
SHA-256: 4d377088771cec85f67ec31c89e2304fcd6057bf12e9adf58e248a2a155ec2e4
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 11096 bytes
SHA-256: 63cdca0aae250e887be27cb5c77271851ab9f4b2ef1acccad907c99ef8402843