Malicious PDF — malware analysis report

Static analysis result for SHA-256 134bc3c5d5236b02…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 05:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed6798256b2a6427ecdc279eeb82def8 SHA-1: ea2b84a02bd30991d547e42c69a5f24d0c39f448 SHA-256: 134bc3c5d5236b0225ba68057ef390639b983dfd1047887c683a9dee89c36bf3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=printing+from+android+chrome PDF link annotation
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/81353506700.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135245bdf2b1---7643179687.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/fibixefesuwivin.pdfIn PDF document text
    • http://espwireless.net/uploads/file/dogoruvuwinezovifafijasu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kofenupadik.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/90238392748.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/nonusijivufolapewimup.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf5866edc---38686550722.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/82cfd665576c795e7143ee91e6f4af3a/66250630055.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/99801920684.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/45781224551.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/98946941305.pdfIn PDF document text
    • https://maturana.cl/upload/file/43334607258.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/18443175324.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/62878767057.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/60096362771.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/557101391.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/fetononutavebarezowiba.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/84551599498.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390eb7923fc---57032896452.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1026802vld303qm9rtheuse67e/3575381499.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/91003309115.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b05f031391f0a41a4798d1638df5a7e7/patalulozuzanev.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 10712 bytes
SHA-256: 0039569fc875476d5e3433ffd418f6222fc75588ccf56e5213339a7a3a56c23e
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 16904 bytes
SHA-256: a5c139af694b7e3a3e19ee19566d958caf4d94b91495ecb5c5642cd671b5267c
font_02_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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