Malicious PDF — malware analysis report

Static analysis result for SHA-256 1045b9a57fa0ef73…

MALICIOUS

PDF

80.0 KB Created: 2021-08-15 01:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c7328525e8423da153aff2d4d351928 SHA-1: 122ca7cb57c5fce231a82124c4272de1d146cd0d SHA-256: 1045b9a57fa0ef732850aafcbc7132962900c9dd41ab529c77ef41192619f397
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to trick users into downloading malware. The 'SE_CLICKFIX' heuristic suggests the document may also contain instructions to execute commands directly, bypassing macro restrictions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=download+autocad+2010+for+macbook+air PDF link annotation
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/domaxu.pdfIn PDF document text
    • https://aokman-drive.com/d/files/4361077585.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/matera.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/pakasinega.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/7oe01mg8ojt6lgi6ceudv7tmk1/74929012160.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84b54cb20---lerelos.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1838af9e3d0ba1f9ef7dc5986b46928a/64228151580.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070186d9b420---guzipu.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/37670500248.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dd60f2c837d---12692893046.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/25/52512483595.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16112dbf5f0aff---xifofifovumik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c6b617b14---81854694956.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a944d7614cd---lariwiguturorubuzazefen.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xexupasaforovalitu.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/zifepovavurag.pdfIn PDF document text
    • https://tsolisp.com/files/file/fimuzikizorevoxamas.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0df60e64---musewugozifaxa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d503250669---35925934332.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9588060cc9---dadimagisitinexub.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1seogl8ic215ar0c4fcji75ea0/jaramotigirobinom.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/jibanif.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/72690194869.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/wevotafenubikir.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608016c640b25---nodugedazadugapotepax.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90ca19cbe---zijifatepefoxo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116043b875b5---vulolezekikigoma.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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 11048 bytes
SHA-256: 5c846c9290250825bf99c4a3d20915e74e13bf9852be18d290d15e695e70ec1b
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 16800 bytes
SHA-256: 64821c96a1651bacc3245afdf7066b7dbe7911d0c36be5ffd89761d3a10ccd2d
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1