Malicious PDF — malware analysis report

Static analysis result for SHA-256 61deac41b186cb72…

MALICIOUS

PDF

73.8 KB Created: 2021-08-05 21:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83e6e4193523151bb3f6fbce409e01d9 SHA-1: f1c8aa92463c2e31538906bd90cba7c4ddd30083 SHA-256: 61deac41b186cb7206675811e38dc1074723bb62da3cfdd28e10dc4e44845fc8
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to various domains, some of which are associated with compromised CMS uploads. The presence of a 'download' call-to-action phrase further supports a phishing or malware distribution lure. No scripts were extracted, but the overall structure points to a phishing attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://matratva.in/userfiles/file/74234515150.pdf In PDF document text
    • http://www.petercar0937494634.com/upload/img/files/kuzunevogonerirutajikawuk.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b362a2ea0e---rutugemolivakove.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b012d728b54---66061340348.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/xolapipefajavimimomajaro.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/76363588806.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b34cc88d---fokogubevaw.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ebe9dc3693d2a5c5de497adcc00d92fe/gufumifuzewafalifozusak.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b841eaeaba1---98644523500.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/zajafadefozo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/sopanavo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160710f115b8b9---23857056856.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j13agdit0mapv27r123jls4ro1/boxesorarosapotorugat.pdfIn PDF document text
    • https://buyafranchise.org/files/files/74209998008.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/799836832.pdfIn PDF document text
    • https://agatanorek.com/files/file/16816549948.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/21043588369.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/50564695865.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d942dee0bcc---61497162545.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/45135584343.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9c79513d---86081286540.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/jalovufigofixorojifinel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+russ+ft+davido+mp3PDF 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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 16184 bytes
SHA-256: 9f894e5b334fe0007a15b1eb3732073efb114e08e0d9bf0f6b6308370688e087
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10952 bytes
SHA-256: 383f8775cc6eedaa10b8659990b72928f03cce20b60caf7ac2ee85d706be39e6

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