Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf09ef0748abf81…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 22:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a31902042715e8099c8291372d73e7b SHA-1: de5c491ff5e07ff871781982bfb480ec0b680fb6 SHA-256: 8bf09ef0748abf81b91dd695401ea418cd79ede1ee30988927d408b3cf71fdd7
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely 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://on-video.com/movies/movie_data/file/27116754206.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kkgchhsl785vsqfvmnkg4hn175/30376470929.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/91012081842.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/94773034915.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/15932311234.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sjj8oslu5he7013i8n2b9p3pn9/47522861234.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44ea67328---vabefujopowewodadegopanod.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0b5d97e5df21b54ef290c72e09163fa7/56391292344.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/96748263474.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906002652821574.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/11860916079.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210908005345.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/40235549018.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/31288978331.pdfIn PDF document text
    • http://prestopc.it/upload/file/31535931495.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/nibupe.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/susimerovatomidi.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/62519295179.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xubafanejiruvoboboluxuwej.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/88043469064.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/fegamevaf.pdfIn PDF document text
    • http://sunway.me/uploads/file/101307217675.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wujuguwogenorevebunuteza.pdfIn PDF document text
    • http://granitnet.hu/editor_up/95688234104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=crash+bandicoot+2+ps1+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 16508 bytes
SHA-256: 8c4316810be7d1c62525c7e0d16e0c511bce46aa99d36a98e81ae5be4cbc2eb9
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 10908 bytes
SHA-256: 6616e918e7868a523ead5939000c77d4e3060da54987a5a14f11c7f70534b56b
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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