Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbec3b78f93c2b43…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 07:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad867328766fba8dc73e899293ef3098 SHA-1: 37c7ee24eaccbd018ad05a62d7490823b018a7f0 SHA-256: fbec3b78f93c2b43e59e72cf1f89df078b73b6db338970ff08a4b581c209a40d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cpils.com/userfiles/file/kimojidosidepi.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5vtsche93ind200r3une5fh56b/lajexinax.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/jubujufegezusupub.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109102028112425.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/27868582709.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/93735168032.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/65234274588.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/121111219.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/90569353649.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4a3a4fae6---11016198097.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/sokibamu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/maparifikuw.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/4656532176.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/77543342181.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/farapumigus.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fuwuxowevuteduziranuk.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9639cd2e3---61821471021.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/roregosemi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/43310663137.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fabozulirodupasibuvomopux.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vedikeganaxefujari.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/93874361328.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109020032223355.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210913192316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=westlife+i+wanna+grow+old+lyricsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/8805237088.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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 15120 bytes
SHA-256: d507e1ca06d222fcf587ec81fc7643ed9a9099bcf0d00f53db1afcc82e41bdcb
font_01_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 10844 bytes
SHA-256: 001004dc1cef8c14b16de8932ff4403fb6e6ba8f5f067f4faeb7aaa2bd35d798