Malicious PDF — malware analysis report

Static analysis result for SHA-256 475eb94fc783547a…

MALICIOUS

PDF

101.5 KB Created: 2021-09-17 02:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5ed0f8932b8112d54796c7d421eb537 SHA-1: cbead8d19245e3b102ea480292c63dd210c16b85 SHA-256: 475eb94fc783547a6cd17d6983ea376276c6dcd9cd117f80816723db7477f8d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=the+art+of+creative+writing+pdf PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f750c033f9---22017584988.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/12583536731.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/79620256832.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/89037995749.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a4430c61---18973603980.pdfIn PDF document text
    • http://goldia.cz/data/file/72176166413.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/77189211306.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/panilujimevoxuro.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikadop.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/forejifuzurinivejegod.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_5316E60D29D84988.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/28ffacab262eaa164542c7a2a8901ed0/40910307277.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa39a45c---rilozejasebitemasagiliju.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/84082735076.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/28974073346.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/83917943942.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/13089469556.pdfIn PDF document text
    • https://kimansion.com/uploads/file/13393753051.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4ef01961d1331a14f4ee40c6b3bb6617/wosimogubigodeforurin.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/2003939844.pdfIn PDF document text
    • https://polytex.de/sites/default/files/76105264426.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/70963280721.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/17261635942.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/pezakuzenowolasiwolag.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_off00012832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 18224 bytes
SHA-256: aa5059a33f94965107751a1be4f88e8f9a70d3da4b1f1212c03567314afb8bd7
font_01_sfnt_off0001579d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579D 10800 bytes
SHA-256: e221d2c70e62ad04a27490ba8715451c82c85235f0b2a4d9672a323e2d58d5f5
font_02_sfnt_off00017056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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