Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc16f46f02f7f04c…

MALICIOUS

PDF

69.2 KB Created: 2021-10-18 05:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0230b0cdc9f181e4db7202d8867df22a SHA-1: 0e46536d3b0097e1d0b5a49c0f40802b5648a8f6 SHA-256: fc16f46f02f7f04ce19efe9ef55c60e49829702c72139309dd58f96fd3954efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with numerous URLs pointing to other PDF files hosted on various domains, some of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://ylpqzl.com/ckfinder/userfiles/files/niporiduvabazomu.pdf In PDF document text
    • http://iktoktatas.hu/files/file/71535642386.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/finedepezaxadejemo.pdfIn PDF document text
    • https://granitnet.hu/editor_up/51951529155.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615c405e6efe7---57915329534.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/zolewenokore.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/40c24b9de5a5b1105c9ca20ae5c502a4/lumilobutoseba.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/rixopisudekebodopi.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lazenepuwe.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1615f79cef200b---4599985514.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/vuzuxajekukeworegabim.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/19474804108.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/12142019340.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/10162651061.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f31323c1e818bde6f90b18b4f7a60157/mivoxizonaxi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/menowupijuganunidig.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/gixukabepi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143769402f24---dudomide.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/fibegadovofekuzisadilagup.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/7584947609.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/fekazemo.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/39082965202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=sql+select+join+two+columnsPDF 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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 15444 bytes
SHA-256: 7c9ad5e90df7cc660786ec41cb1111997cb11e50a243ffb744daefbf8d3b3de0
font_02_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10668 bytes
SHA-256: 314f743176066da82f34d68b7ea83891e89ce81d044c169d11d52a72ba540031