Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d7ddc28e4d00f0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 05:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d35d1979fc995ebf708d3bae1817ad5 SHA-1: a16d7209fa3357024f8c9c50e56c4e3d7fa28389 SHA-256: c2d7ddc28e4d00f02cf047b5c97809b94a802948d58892cf0fbf64de6295961d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 https://alnahamgroup.com/userfiles/file/72361831996.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/5800158327.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dujatasimo.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/20499906267.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/86325282126.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gogazalofitozapivi.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/73546802679.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369357ad64c---50556172226.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/32908987127.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b470979e1f---67309016196.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/33470125811.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa6fe6208---fuzimumobasa.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/97697492000.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/573302605.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa892276e---lezabefate.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/49477916416.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/fexud.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/kozonozelamafububafaron.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jukebegagifotabaw.pdfIn PDF document text
    • http://banquat.com/userfiles/files/20113524343.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/rerowigowafadutewobufaxa.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopepu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/99241337619.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/naniluzinibutamibulala.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/meziwaxososonitaxafimude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+brief+history+of+time+ebook+downloadPDF 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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 16884 bytes
SHA-256: 0f12cb9685c98bf018a374084be28a431fca883869827aaf9c002537b70ec674
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 11032 bytes
SHA-256: 6201c85a7611d41ebaedf5f6885d8dae32e9cda8fbecd0dcc91300d1aa727485

Open this report in the interactive analyzer, or submit your own file for analysis.