Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1f9527e1e95d68…

MALICIOUS

PDF

87.1 KB Created: 2021-07-04 22:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 808aea54a414ec4e6bdbaea70b79b477 SHA-1: 95736fb7f90072f210d332069040c380098ff362 SHA-256: bb1f9527e1e95d68dbadc487d7526638bd951dc38f1737b762d94b33683c6e13
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host malicious content or facilitate phishing. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9cb75a671---sinowitiwexav.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/be7f2a98acd590bc13e5c6e2bf90080a/modowawezexodaluwebitotu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d04020e---rozodomafazoxizuw.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aaeb2e77---fevevav.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qhq5ailghotsavikan32bi44l5/9564067058.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608155db2f95b---zimadizoludalobafadudop.pdf
    • http://airfa.it/userfiles/file/82059515351.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/13bfcf0867acfcf9ca50d154693267d4/jamanavegafamipi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160866dfa6e239---79761157204.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607769d5938ed---guxovobexilazirubaxoxofu.pdf
    • https://maisonforville.be/documents/file/98351941058.pdf
    • http://dilimkebab.com/userfiles/file/89024218029.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72bff852e844f91f4b399eb5d1be4dfb/9848700742.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/df0a90baa4c66f294d69e1f03703269b/dusuvejakuvixedelara.pdf
    • http://buren-kompanie.de/userfiles/files/7967718846.pdf
    • http://npas.ru/pic/file/timisuxolizadeluzagedam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=22mm+in+inches+fraction
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 16792 bytes
font_01_sfnt_off00010f21.bin
783a12c20b81c75412f733dd6fd3095af83af21c93951e3cbe3550c492da75d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 15880 bytes
font_02_sfnt_off000137f8.bin
2f4f5fd6ac95aced456ff746b9f1289a9f7b7a4ccc3769a721dc0e8b03098563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 10576 bytes

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