Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0096c058fea354d…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 07:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea1aa9a038c24735413d18a331a93913 SHA-1: 5bb1f4178c371f51ea6ccc0ccba476093698ef64 SHA-256: c0096c058fea354dd9840f7e20a61a577c8473f6332d5f4a6a5df567b8a56905
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable binary data, indicating it's not meant for direct user consumption but likely contains exploit code or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://liburnia.pl/userfiles/file/vamibibuzikujo.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848196cf239---40176731889.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jonekelo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd96a74d4---zekefi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/milazuzifisevitixeduxifo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/luvogazigiv.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/51028203195.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2020ddba34de2d58203f72ab521f8897/68081143107.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/bivaxakilumopidaw.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/88964022711.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb8370b49c---21159188688.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/18f0a5c49db5859b855d0dd7ada3e8c6/44181953250.pdfIn PDF document text
    • http://aquatherm-graz.at/files/52304680500.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/92521880333.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b9954a7b---4257122647.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tr2livfr39896chtjsgac0l07u/jujemitufawugu.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/pagivupududuruwulopuw.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d0116e76---sarisulededimovemakexo.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/61537735732.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/37032635839.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5aa0e973---javutupepofejewelametira.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200789834363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=muscles+of+the+trunk+worksheet+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7a744ede602b22b45e16f6f8a05f358e/48689318419.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_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 16880 bytes
SHA-256: 22e85abfbe83a537e2612c08eabbc6489fb7c165e163f9a12519cf8f34071a38
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 10612 bytes
SHA-256: d6ba0c916a851277e3dff311ae3314778f8c11488bed0b14a5d60efa4226d17a
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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