Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08e13603d1accbf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 08:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2fff97e2415f7863302320d5d4722e96 SHA-1: c23c4f42a5d08bc0b595c3c9543025b1aff2f0db SHA-256: b08e13603d1accbf45dde325469dad30c03b19073a2c92829f7eb27d5b496e2c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/letusomo.pdf In PDF document text
    • https://ascii.tn/web/cgi/file/vezuneguvopig.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/vasoderarafagijijiki.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/lavavesozosedadapi.pdfIn PDF document text
    • http://wsm.hk/images/files/36430361881.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/lapiragotofezewu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c46470a67---pakatukabagelogeme.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613978eeb8668---kebijatotuwejotemed.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/pisobitob.pdfIn PDF document text
    • http://odumakus.com/uploads/files/1348983278.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/46150739123.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/dimezumepevedepunezazok.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6bec63f---89085710860.pdfIn PDF document text
    • http://goref.ru/files/file/98126009486.pdfIn PDF document text
    • https://31app.com/userfiles/file/37784953980.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/joraripema.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jusovumezajo.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/76803111567.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/2018590465.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/16179208286.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161380c0e5a2c4---46241621516.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b12e9f40---23563601306.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/34643070206.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/xinigi.pdfIn PDF document text
    • https://doitoutdoorz.com/file/LWbbpwat3OlznBhA.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=approach+club+degreePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/39415413605.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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 18792 bytes
SHA-256: 4527366a01f1d0120192ce661b42834c23847219e38102df1901da9c8a5c060f
font_01_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 10552 bytes
SHA-256: 732815ae1bec72cfac5957c1e5de8c1d5247dc800e2baa61c33164cf77a36089