Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9e3dd2cb8e13aa…

MALICIOUS

PDF

96.3 KB Created: 2021-07-25 12:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0884cfa7e9cce57252ff44a073a23deb SHA-1: 0039d9650caee0b52bed2b836affe19cefd7efdc SHA-256: fe9e3dd2cb8e13aae629862a936d9ff549e6e65b7db5bb4fdb877e3c9c333921
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points to an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://budka39.ru/files/zitorovam.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608480b0639d2---56987966933.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64d721c79f---71929148174.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/28584664821.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/2554535944.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/jazazotano.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/72979567820.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/07013996134c0185f5c1c6e5202afdfa/10744388027.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b480a5537---muzagasedolisirufevowizaj.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/simulegetipupejevewojuras.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/220e2e06eb38766528acbeaf10d8b6fb/guposumuwan.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ba69a59dc---4190916973.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/10637760355.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/92985927174.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/pevegagegexa.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210602_868DD644C80DFE49.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc3be657e---22722939201.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f358d0a720---guvizomu.pdfIn PDF document text
    • http://susutour.com/userfile/file/17641555414.pdfIn PDF document text
    • https://shibbirs.com/media/files/dejixegorivemagiza.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/vilabomodo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16232015957.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f376fc24---badexafefatak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+de+partes+suzuki+en+125PDF 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_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 10816 bytes
SHA-256: a5994233ec53c12cfedb0e64f531173bfbd82bd6f260278dbf5f9e355c54db50
font_01_sfnt_off00012797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 19596 bytes
SHA-256: 1f2ecd0b801908a9492cf1a3e252ef5adf52f339870c0a9cc0fc31092672ecc6

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