Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e99f753d5807d3b…

MALICIOUS

PDF

95.4 KB Created: 2021-06-27 21:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0686b38b9038219fe7a2fcf18ba82b SHA-1: 180269ffb2c4ffb360ec5cbc4e4137b34ce6ccf7 SHA-256: 9e99f753d5807d3b109528f4e07ce9ac7888486d76d45dcbcf517a40de82734f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63710bb4d9---dukakafowafaxe.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/vawik.pdf
    • http://personnelstrategies.net/userfiles/file/65936822333.pdf
    • http://circolonauticofavignana.it/userfiles/files/napuzeki.pdf
    • https://happycolaborativo.com/uploads/files/wonabaxe.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070378857e7f---dagutiwulera.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/15200783501.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fc72d3ffc535a95368b84d1714c5d668/genonununax.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c7723f6ee72c6ccbe6bd278fa7fffa75/21523980529.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b615f713f6---jabonafagolobigom.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/75c94eb2c93ded0cb7de20a432315833/18080968062.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/df0d5dba2c13027f3dd5447aa0cb1a25/23675546299.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/463c9f764d3aa186fe738e2841ae795e/xizizumarinanubiforemus.pdf
    • http://ed-web.cz/userfilesfile/danamotidola.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/171e3f251c6e28515ce3e5839141dda4/mutop.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160946dbba218c---3455461129.pdf
    • https://pet-fashion.ro/mm/file/52903781148.pdf
    • https://x-software.cz/data/file/sixuluf.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b050e47752933075ad3eceece0803476/27756204045.pdf
    • http://www.aportecnica.com/imagenes/editor/file/gowisi.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5327f62f6a---3065174810.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fda445c40b976fdd177391dc8a59cbde/ganibutax.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51835d56e4---34815269093.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a2ed9b18f4ccf55b81901f3b2a3053a8/90538926210.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160963a11e2d2f---98808957787.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5363c7242a---67876865140.pdf
    • https://puppometalli.eu/file/gufog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=song+here+comes+peter+cottontail+by+gene+autry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000effa.bin
ad32b0fcef9ee552226f0f61aa5c2f8a5f02ad082a76e554b64d96f5b3be8ede		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEFFA 18924 bytes
font_01_sfnt_off00010e67.bin
93a04f26020882285bb614341ae1f22ca52086f182f40c630b400229a7203af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 17312 bytes
font_02_sfnt_off00013b78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 16792 bytes
font_03_sfnt_off0001538f.bin
ab4e2bc6e7305de3f731dab126e298df3e7c54286b8a3257e2c99ea54349d1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1538F 11252 bytes

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