Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffbe9eb1b8cb8f…

MALICIOUS

PDF

80.7 KB Created: 2021-07-03 23:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d1fb5bab0bded14c843e896993719148 SHA-1: d52a80ce31c5545f4344262d608e57f7451751e0 SHA-256: 0bffbe9eb1b8cb8fea7d70276af48a086abc614e5eb03596e5c52f2c05f2b318
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting it's used to distribute further malicious content. The presence of numerous external URIs and the 'link farm' heuristic indicate a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ph2020.org/FCKeditor/file/51256689098.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/84525e02db3cc6221f03b4c009e48bde/61847745535.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/6372390509.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xedusesulejukitufavomut.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607528f133669---bezafagigawetexumutu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb091d5b64---65060477623.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609443a7b3eba---susolajesesaxawegivisaru.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/9993395869.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s14v9pbeppmtuicr1lqjgi5pn4/11047542619.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/50023399567.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/78814514390.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7090b591d---14105011003.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65bc6eb118---13123508035.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/35f42a60870893f5742fb3929da9e8f1/43191568112.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210620011854.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/86974940928.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a8f9113b6cac1b5a9ff6d0fa5cd4ddaa/tadelax.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sajasegasazezofurimu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d41e2f28fc45bcefc04c857b5769f909/manulukemav.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5560b1740458c20f3c6ed37fda35bd57/lorupanikuveferur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+propinquity+in+a+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB1 19744 bytes
SHA-256: 284d2f5468e660a6a1c36c3ed4cf90882bea1176d1719f5c38876ab04851137c
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 10688 bytes
SHA-256: ba57b188a432154224a30938fd80dd70ebb70ab38a6b031b9a9d9b2921bcff0d
font_03_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 16068 bytes
SHA-256: 9ccb3d43a746bf17a5b07d0805ca48daec8ae8b843b706687955c4dac133dd41

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