Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb338f4b9c3c27f…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 06:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8ab6523fe5fb6c7cc1346a77397ab07 SHA-1: d16b31d9451f88e84cbc363d31c056477617223f SHA-256: 6cb338f4b9c3c27fc579fb6fe9edb87df1aef48735e14ebb2345c95d670cae41
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The file's structure and the presence of external links strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138501dcbe---11730012949.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/82525851714.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607548048539e---novosilase.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/45347051923.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/62275237127.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nanokuwijorowog.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/pidevovijulaku.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/38738558811.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b292dc9e1c0---25611220707.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/35559595921.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/99770247368.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/64779228202.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92318e49a---risurutazojo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f18509000---kediwi.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/sirovivofomuwolavap.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/50781888699.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609edab815629---voxabadereweruliguxetegi.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/65825218929.pdfIn PDF document text
    • https://energooptima.hu/upload/File/73477398720.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/duzadobekuxodojegasix.pdfIn PDF document text
    • https://tmtteks.com/files/gabazarafemaj.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f49ba8db---2567278726.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f8ebb09a22dec7c0b75fda35efc3955e/32241577283.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/pisegomoxovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=esic+udc+marks+2019+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_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 10920 bytes
SHA-256: 4cf81a877f0631d6f0153caa4907b6c5fb0b858534a1950f98c7b718b332d7da
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 17876 bytes
SHA-256: 7e63e3aad9015132b25dbe6c087093e910dd8d372b6b475163efbe6eaad516d9
font_02_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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