Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bfcff49879db26…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 15:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c08cb97337566ee89ba3385986edf3fe SHA-1: 54acd2acc7eab9d175fa1ad7a52ae82b8e2d7ae0 SHA-256: 78bfcff49879db26da8bbba70c30411cd929fa0e4c08c5668cc56d5b8cbd04bf
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=android+apps+download+on+pc PDF link annotation
    • https://byocamacho.com/ckfinder/userfiles/files/89873028885.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75638890454.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/58421974388.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/81012327663.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/46904857069.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/19676493580.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/relenikevujubilewamuja.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/20621879917.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/vatax.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/nawifonaxajebukurimav.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/belazev.pdfIn PDF document text
    • http://mlead.net/images/e/file/99732574986.pdfIn PDF document text
    • http://imbirimbir.ru/files/saxumafubafowowut.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/17096450351.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6a76a736e79c2b0c4e690d20bb5b24af/sizijetevuxijikupexokezid.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/55128779182.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7788232ab608efed79d3c664ae86b590/5252493037.pdfIn PDF document text
    • http://ranchobg.com/img/file/60420027636.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/87243764536.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/50381403089.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/dulazevevozufelele.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161422e4a9b3b9---67755541543.pdfIn PDF document text
    • https://istanajp.com/contents/files/kejipimenikaruparoxix.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae01f6d272---xufukofenakiwesotakojorem.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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 16568 bytes
SHA-256: a69606b1d5beb3ca8ec16e6c332bab4565f8072b19448519f3bfeeadc77634f0
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10344 bytes
SHA-256: 6992f54ebed8fd0916f10233f93e19c581f0aae12e75098300ac48501e621912