Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1c38ae3a0e0a20…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 19:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 187d7558b9422d8dd6230503095f987b SHA-1: e0101057aabb2948a7289f739e60a1778a269d1f SHA-256: ad1c38ae3a0e0a209f9208813ace6a8c123b9c16961541e63f471bca7828aa12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/kokufiminisovorewizomuwuv.pdf In PDF document text
    • http://indianspringhomes.com/userfiles/files/bozove.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16130a54e5b510---rujaxekisule.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/figakexuze.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/sqdgochu4ae8s8oo1juo2fmcv4/texed.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wapupenewegexadab.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d73f639cf---zupenun.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/pepuwajeb.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/41162910331.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/xidudosefokaz.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/zovijanemetotaro.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/refinovinigikarulof.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/22888680224.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169b7ebaab---dovabiwixo.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/buzezubimazamof.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/tupasowo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mudoruseligejelenuber.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161394264827a0---zezarazopitana.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/24276604889.pdfIn PDF document text
    • https://vientangluc.com/upload/files/4204849495.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/towolexirutadap.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/sivosubuvakumobuf.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/47338472187.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/labavazanufopirifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shadow+battle+mod+apk+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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 17680 bytes
SHA-256: 8f9a73a3aba19e12e6fe6c749e471b5d9000251c2f139c372081e69fae0095ca
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 10692 bytes
SHA-256: f0a9fbe7a64e06638af7a222a5e159d9a54e747785a5c9ef7f5b20061f1d71c8
font_02_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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