Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a23ad76970695b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 08:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e804ad6ce67c942503efeb299170361f SHA-1: e48f0b4f8544c6f68f0e7b7ca8de59efa54d4a85 SHA-256: 06a23ad76970695b08065b647f5d06ab7d5682efb27792ac16b4fcfdbd1f6329
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, likely for phishing or to download further malicious content. The presence of numerous unknown URLs associated with compromised CMS uploads supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://kurashi-kyoiku.com/cms/dat/upimg/file/4880242679.pdf In PDF document text
    • http://greenhousehotel.vn/uploads/image/files/welajukubalo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108070018475642.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c6c29602---tixiluvopuxuzefi.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/nipunaguzibomovutajorazik.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/46efd54cd841419c12f8863319f3c530/wosijubetibipapelexavufe.pdfIn PDF document text
    • http://rubensova16.cz/files/file/xabolebovimiru.pdfIn PDF document text
    • https://belloverde.net/emailer/file/zilovux.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xetufodozivunivijimi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/eb2de982bfe571170147f9d68fc354b9/zebamomufonasifowo.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77271304677.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d25bfdb56cba90f72a3fae69bbf3abcb/85703992776.pdfIn PDF document text
    • http://htwy.com/upload/file/kusimiv.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4a21c2c376a48e920f519ed0184e2b2f/79477927346.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/wepexak.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/59971444607.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a6463489c24568cb6d40312a948850bf/72313710173.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/25456410901.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xapap.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3a27a9a43---78410158659.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/dasisiwowavutimo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/t0cu085klhu1983i5e4lf2gkrv/75200751096.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/vonarojoxubusurekeweru.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2lj7vgm0k4ks1ic03b7usmpk2/jupokomigezivo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/vafunetadasu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4dff2448---weneseruzukokalavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=moves+like+jagger+piano+sheet+music+pdfPDF 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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 17112 bytes
SHA-256: 52f901d007fc05ffabc18a1a1dab9cdc9ccf4282604b9908f794b780097f9add
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 11448 bytes
SHA-256: f03b19e9c0444313188c38f6562d48e97c244aab6a5b25e86e2635b1d9169a54
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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