Malicious PDF — malware analysis report

Static analysis result for SHA-256 6defa137d8f21bdb…

MALICIOUS

PDF

116.6 KB Created: 2021-09-07 00:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3ba3936c71fa94da622527b1ee7d47f SHA-1: c59c5e2e7a9fc622057b0e4b2878fa5b64225b12 SHA-256: 6defa137d8f21bdb507c660ec9eb93c9422d373370578559bfe48ea67d687322
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document's structure and URL patterns align with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://world-green-hope.com/uploads/files/18008735413.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/gebesejes.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/74664775032.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608843189448b---43158483018.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/71233465881.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/gesukurotoledikavux.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5e8707906c023d706371842ec4e60e6/gumejujurum.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/90539741918.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/291be27eb6621d66166b035cb2a76fe8/gomipudufogodob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa38424fc84---62513763371.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1h1n209c9q2m85d2v3cc1gu764/rukodo.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/68378095187.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/papirukezememudob.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u30tat4jmouto8iv9pdfmktnmq/vukivabubarapisovejik.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/73199395546.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d14cda421fefcd91877257cb706d16da/41550355912.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/worusomowon.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/bapimuvovizodo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/96144495863.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316216aa6d3---suxipixet.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ff17471f---fedesezogenutafa.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210524112438_398479400.pdfIn PDF document text
    • http://princeverma.in/uploads/files/13215313229.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/nejefosiwi.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/tikalifukefelikote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ielts+cue+card+2019+with+answer+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16195 11196 bytes
SHA-256: 2371a6dc4e96733599d3b8c738ae5e4a7d64c24e7bc5bb79aba63c3f1157b350
font_01_sfnt_off00017bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDF 18816 bytes
SHA-256: 4d2820657417091f20c08a229c6390994d0682ed48bec4aea21f37b1c7ef52a6
font_02_sfnt_off0001ac94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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