Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce13ad6d4db224de…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 20:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05db87557f4eeb43b1b1abb392884dd9 SHA-1: f2f1e670ae89d23cf36b4651f9ce06855d42297b SHA-256: ce13ad6d4db224de9d7fb79cd9f58059d4ec4e4113a3273939e2a111918bc26b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to external resources, with several heuristics indicating a link farm hosted on compromised or disposable domains. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to trick users into downloading further malware. No scripts were extracted, but the presence of a visual download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://vdavloeren.be/userfiles/files/67243191857.pdf In PDF document text
    • http://wwm-quanta.com/upload/files/nisojetegupewugabix.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/96148339630.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/35078801620.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/katoranobo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/44474814389.pdfIn PDF document text
    • https://windscrm.net/files/file/43051101865.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/mupudof.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/rusoliwebuduw.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bapumut.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/81421495606.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c0f68eee---16634220622.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161406fcf3edae---lefipekexuwup.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/80639600691.pdfIn PDF document text
    • https://maturana.cl/upload/file/dapolel.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5cab1af82d4a7c8552efe80b55419bd7/nofozopogodisesidag.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/48517019252.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/86827819813.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409d2be907e---tajubofiv.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/63548855328.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/79917409749.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/29038167515.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fujebavigixeniwiliwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=test+dpc+android+6.0+downloadPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/56786812278.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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 20504 bytes
SHA-256: 6bea62455d58b87ce256309938d95423ba4e8673577bf46acda2c56330e2d109
font_01_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13195 10912 bytes
SHA-256: beabdf797a95ac2df15156c804043f4f0778f764abb2c21ff4d80237918a4e4d

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