Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5bc0b4d7650f36…

MALICIOUS

PDF

136.7 KB Created: 2021-06-26 23:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fd63c15b3271e557ba55df151e6b067 SHA-1: 1db10dce7c4a6931b52cf471a22e92d9686a5309 SHA-256: aa5bc0b4d7650f36fe0a0d76eada2d9142e4e24591115de0fb50fb52a126f2ad
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to lure users into clicking through to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. No scripts were extracted, and the document body was unreadable, but the presence of numerous links on compromised domains is a strong indicator of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc90dddf51---1091797897.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430f474f4d---kapazavaxinupuwilirixuz.pdf
    • https://latework.cz/soubory/50139929697.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836d37ec81d---kamanukexumesitaburar.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dde4f58d7277c2ae2125a455240c8a83/49452960178.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/3ecf9d504cd1ce0ada8b2b3feead45ec/difunubonizumixofamatexu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088323f8f0bb---44582064605.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e426cc0960---ganivutezimibojaxaju.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4256cd814a---32661441300.pdf
    • https://agrilaui.com/userfiles/file/wiwawelitarutelovutuzavu.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1f346ed2---59170614601.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77aa578b9b---58060582876.pdf
    • http://beastyenergy.com/userfiles/file/poxubisuka.pdf
    • http://arniestribu.com/campannas/file/16584448360.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3994fbca---xusowenabadatagozu.pdf
    • http://bike-aholic.com/UserFiles/file/wixisufe.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/09ae0353bb8f9085575eccf30d002185/fedejar.pdf
    • http://pileshoppen.dk/userfiles/file/91766761749.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce34ee2659e---9852235963.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607667b299eae---tiwubejajiniv.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9j8t9e76apql1bc6mafs7gqfu1/45549820034.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=for+a+particle+in+uniform+circular+motion+the+acceleration+a+at+a+point
    • 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
font_00_sfnt_off00019a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A61 16792 bytes
font_01_sfnt_off0001b272.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B272 16168 bytes
font_02_sfnt_off0001c80a.bin
c733d998ad38347a7ffb2bc9f4ccb9d85e84b3c26f59e836cef45f5c759f79ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C80A 19520 bytes
font_03_sfnt_off0001fc78.bin
b1c2b2ae0e1c686ea32c873b37a9ea67222fc25615ce44d9096ea28b3d238b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC78 10652 bytes

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