Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd60d970c1e230f2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fda21d15541344e65e594a802614fdb SHA-1: d299b745358c44de55c926bdf280eb66436f920b SHA-256: dd60d970c1e230f268b0aa84aa338e76aac9373444c1aa0160df2d54a6895163
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oryginalnedekoracje.pl/userfiles/file/jowagebaduxigujo.pdf In PDF document text
    • http://www.binghan.my/userfiles/file/datusawerezevif.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/24198309523.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161439e0ccb74d---nudanobelipu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8d91cc88be6c60366da7a9dfd862493a/19477662257.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/52493628891.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/bilevepubeke.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/tisugu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091818571612.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/gusik.pdfIn PDF document text
    • http://newo.ru/files/files/zelas.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/90798210904.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa0791800---10455706533.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/99424231734.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9860d9472---70174202695.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6cmjc5q8nmaoeaspo7569q0oj3/kogumidalodozejobamulebix.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/jebivuxipawutobofaga.pdfIn PDF document text
    • http://sciattella.net/images/file/welenejolup.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/30113287493.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/43378949208.pdfIn PDF document text
    • https://grnca.org/img/files/files/22093479724.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i196e76fpua1lc8bovvlqkkb73/gexuxul.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/30283413187.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/jozikupakasusepigabasejom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=split+pdf+androidPDF 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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 18080 bytes
SHA-256: c2909967233d2a441bb70a60f22c97638de29584deaa714d978398b9f97e079b
font_01_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 10264 bytes
SHA-256: 76c91150638d5cc31f403b50b4c4b53e589f349ebe98872115fd9d5c3b77d621

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