Malicious PDF — malware analysis report

Static analysis result for SHA-256 687f66874e1bf758…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 05:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 503395d7d97dd94f570b1c4cb949398a SHA-1: 57241b4110fdb1f1a41a909206bcbbf0a8ad2e48 SHA-256: 687f66874e1bf758a220412ac63b61803aec4b0082b2c82c4d3a2ba82842bbc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of multiple compromised CMS upload links further supports this, as these are often used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=sword+art+online+13+alicization+dividing+pdf PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4f57c29a---14152361640.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bufijolokutibifunewofi.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/refoxajituxegageto.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hop2pi5qei1s6684rp51lcc687/19923637574.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/43789462092.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/fowuki.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/27033610895.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/96800854967.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/toweniwarim.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fad67426---81693549568.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zofesezajivozofikaza.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16117b36f83010---29445339672.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1985d847b---jobapesaxadidogew.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/dugadinuzoja.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/pakivopavi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da97bef46---xobivobem.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087f45e1c701---52795587953.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607918f0e48de---59326745140.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2edc3b42---kemedavoj.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/itski9odmo7nuphj49m6s3pv0l/bawawefesezabemovewutej.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_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 17956 bytes
SHA-256: 5473d9078f62e29a14467e0596ab469f399cb4a0822ebf0341d0a4b3e6d50239
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 11136 bytes
SHA-256: 41349712ca1d7ce9c9c9754bff64f6756e729acc2f48e6b6a87bef4694f7235a

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