Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99ebeb392f40ea3…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 02:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b3244fd6c6c7c53c75e687bb0842efb5 SHA-1: 8622b550e9cd844633809d51a020deb2ef26e610 SHA-256: d99ebeb392f40ea30f05fdfbc22453912a72d7bbd555e81ac9d08a4af78b758d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd4a679ae---ximuz.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16158ceaf22687---wiwuronasubifa.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/sebixujepawub.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/39721375201.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zitujavisewix.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/64579384160.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/rikalasipaxabo.pdfIn PDF document text
    • https://remini.hu/userfiles/file/sovotafekofibonevenazoka.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/pumebojifubivokuwu.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/jozebeku.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210906_9BFC926584DDEA8A.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/89589211025.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/vodegujusisi.pdfIn PDF document text
    • http://guchen.ru/d/files/9166729297.pdfIn PDF document text
    • http://dakmet.pl/upload/77990424875.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gafigajodaribeputuxawabep.pdfIn PDF document text
    • https://kapefashion.com/files/files/fixunawux.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161427e8a71d39---kawogoxinidinemovefipe.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/86238306434.pdfIn PDF document text
    • http://gysanya.com/upload/file/210912095442276716fe9ig09j9ylr.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/98640583957.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/lixikafidipevadupusinu.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/11375731110.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/wokunibogusogabelenelozir.pdfIn PDF document text
    • http://byecook.com/ckupload/files/33363085222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sample+case+conceptualization+and+treatment+planPDF 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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 15860 bytes
SHA-256: 93ce577431ef8270ba60120d2acd47500cb7dc37a2e8299bc5f38def8571a94a
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 10912 bytes
SHA-256: 58a524c4fb51131555e3ee657647570acff391b0ce4a16b560a2a32bbaa1f20d

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