Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc37d42668d8cb25…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 01:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ce9a69aa312b1bc0dd4a9285d2ae960b SHA-1: a400e8593c5bc40a6ebe20c1a911330c337b7beb SHA-256: bc37d42668d8cb257e9effb1c58c811e55d7887fc164ca2e0691ad1b0c4e3953
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves luring users through a malicious attachment to a site hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gryf-wet.pl/ckfinder/userfiles/files/tidokotedebakulazuwirugaw.pdf In PDF document text
    • http://rosabaum.de/web/editor/files/ligeriwadabe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614309168618b---binivesepirunilefadufuraw.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5artv4fl8et2tfaiknnlsvas0i/tigolopejured.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/roxasop.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r2rf8hqf9ck24rcf0u96jtjj6o/kigezu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wefowurodeluzadunopu.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/32251142860.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/nitogizagenubalaf.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nimijefoz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f264ccc4c5---73295484476.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/1129413340.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ddd4e5e50---88077707356.pdfIn PDF document text
    • http://klenderbio.com/upload/files/79654313306.pdfIn PDF document text
    • https://advik.net/userfiles/file/nagexekajokexuraxujij.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/91384339472.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3aa94444---fokufidadinejigosovasu.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/24251909427.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/kejilorunug.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/55366317946.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/42981341410.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jtfaapkrl6r4br82dni9sc9488/batelivususerofi.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/39548243924.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nizenewizizivim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+virtual+keyboard+in+androidPDF 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_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10848 bytes
SHA-256: acb21bdd335d2b80817ba49245bc23ed04658864b7267c7f03db702cb2c9d46c
font_02_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 18692 bytes
SHA-256: 1bd16fe21c389a6125ef4241949c924534d9a35090ca973cf9370803ca0bc796

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