Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a3c09c8f5d7710…

MALICIOUS

PDF

101.0 KB Created: 2021-06-27 03:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a1c12b84e0ac02e780bc224140d6dce SHA-1: c47dd2df39bd4605c0be26e2bccaabab161ace57 SHA-256: c8a3c09c8f5d7710789ac588ef0bbf9276cb19149dcfc39fd8552f8e119461e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, which are likely used to host further malicious content or phishing pages. The presence of external URIs and link farms on disposable hosting indicates a deliberate effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://krisoc.ru/uplcv?utm_term=color+by+number+plate+tectonics+answer+key PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808372c45d2---vipeweteb.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/jejolaja.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0qlu3k645loiskqe2qgmdf8tql/59869025230.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gibojebusilajabigeronok.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/2292368941.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffec14bbc8---95023293182.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/86faef9dfe5932a3d7a3cdf63d0cf194/78869159968.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0179191001624353367.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e05faa7bd436c0bab1ed6337b860b2e/vubenase.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/38b9cb98011ffe45a5926ad8f444450d/wubalolubiseda.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870dc761a82---ritupigiwevamuto.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10150305810.pdfIn PDF document text
    • http://kme-kme.cz/files/file/kowedigawi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608514f4e8434---78638806537.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4120466b9---89289478771.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/14a8c26d95e7d91d454deae8e9fc84a4/43061064186.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/sojiwotanosediviweje.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/thjkqtjaac3ini4modetbva932/romomiletomix.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5110181c27---jurowiz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1584fec813---18578152021.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/dbtp1uu11fe7aovvodlhjplpl6/surebosepixunevan.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/85502412256.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/wowaregidokuganadijimazen.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_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 11100 bytes
SHA-256: 9bd074a234703059cabf3846b9e49592164b94a2416d577b1c802d441bc96deb
font_01_sfnt_off0001414b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 17344 bytes
SHA-256: 73b404ad92b61b5c7220318974ce822756c2cc09d35f2c98fce7d3a69b43a16e
font_02_sfnt_off00016e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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