Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e847b694c70ea3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 04:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9416e682505918a2831354bb2c22d2ad SHA-1: b54928c6c726720725f0906b54c5ea9d033e5cbf SHA-256: 40e847b694c70ea3046afb39670d1d5d80ae255cbe6f333e4e99b09fcb9413be
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites likely host further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/kefemoke.pdf In PDF document text
    • http://jgweld18.com/UploadFile/file/20210906120924284.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109080907002992.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/20605798659.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/71548353436.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/zetove.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/39111783045.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/47966289227.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/82794213515.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/delilanobadilus.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/54105690641.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/61407466210.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cba8c69d5959b7e833a0126a68fa63a7/sinuselewajokawapowow.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6af2b4b78c871c43b4b7ebbee651429a/nujisipagakidixizutu.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/minikolesijuxofefoxotegam.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/7409278058.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/21801809923.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614576412b549---vulavex.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/15742767325.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/707442c9eb8752aec47aad00dfcc279a/nereludedo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaf2172c5---rejobomel.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/tapezol.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/biwokedolumilesufuna.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613096c672f50---vuganozipunu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pikagexodelanifolizu.pdfIn PDF document text
    • http://nemalipics.com/laxesiberesunitut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hello+yo+free+voice+chat+rooms+apkPDF link annotation
    • 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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 10904 bytes
SHA-256: b96248c73ed5d4b76bdd6fc9073aafe0004bbe43eab256b98956b0a3577162b2
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 18484 bytes
SHA-256: f2c79f9241722237cd3fb5154e5a50c95d4dfcd20a8df9c95c7de74d970ebc83
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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