Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d500f90c28052ef…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 06:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f30d7b16b554bd19d4d549e5b996dcd4 SHA-1: 87ec87d694b5663f2dc6cf184a5d8337247f1681 SHA-256: 3d500f90c28052ef3bad8f4a4866f0982fe73d50a5fa9fda03ce9e915682c3fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of external URIs and a link farm heuristic indicates the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://chizclean.ru/files/fck/file/34844322714.pdf In PDF document text
    • http://kpghomerepairs.com/uploads/image/files/dukuzemukisovo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/15529153158.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926c5172d69---zeborexugusanoge.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b796e7030d39e5390a7e98f169bb7575/towuvatopurusozuze.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupipojekesuvevakakabo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4be20728e---99216272914.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/fbfa8f6d1f7f8f113619a03e387a8d4f/mufasamamoxowik.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/disugowowusaselizis.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/86609755910.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/085d51484a717727f5a23f60e8a90826/94019907510.pdfIn PDF document text
    • http://rhondachem.com/d/files/63174178237.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719c696ee8---39042720458.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/5079428446.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/mafidafaruxetunu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16118f8bf31899---vogelegupapogijolezeminuj.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/ferupok.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160739f8d1ac75---16493535673.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3498986441e94916e2b15cb6ec4a4a80/95146527355.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7118705bd2b105bf5df6f5302548c82a/56291027267.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gd0hstbthvhluo9dthnlna6eft/33313936467.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc9c8f9fe---tawugutozujoken.pdfIn PDF document text
    • http://downloadhindicoIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kobi+comics+free+download+pdfPDF 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_off0000b4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 10900 bytes
SHA-256: 32501560be83c40f9af011ab7fd16c67bf1a247141cd6a3e964e4d552eb07312
font_01_sfnt_off0000cdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD2 17336 bytes
SHA-256: 41123e9666405953349ab12bc3bb4d76f1e6ca49b25edf2040dbc6b15b01d030
font_02_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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