Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf612f65575f019…

MALICIOUS

PDF

101.7 KB Created: 2021-09-03 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7992f53e775dd9ecd5257387631f963b SHA-1: 4930a18709bd8e1f9a368c5749a324c02cf0a31b SHA-256: 9bf612f65575f01951ed54a785cab23a9db28bbecde9f851fcb1d5e504f5c15d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ac178645a---nodisogiletifatakepaton.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/oqacmrkg0d957t9an683pacuo4/tenupu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ka0ivbb6l3924g680lbli8mlm8/gijidelekazuvodifazafapa.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/botibabegizosexu.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/jijaluwomidevotoxulov.pdfIn PDF document text
    • https://fuoriscena.eu/file/9537386281.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///gapikofepeditorumobivi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6djhuml7th9mjgfer12p7bhl9g/direvewanosu.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/tonesusipoliwegabobufipej.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16122541a0e195---gojiwafilud.pdfIn PDF document text
    • http://labradory.pl/file/18286494828.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210702_B649A94D3E23AD75.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/deligexezesewularetu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/21d944b607b74858c74dcb937c458700/sejelalarixafudiditofox.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ec459856---420041664.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3cc4a4a0563345e6dbf2b7d96ca83b7/83410730943.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/sorulijotigusumapewikobo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5368400dd---feluladelegozofasidi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4d5d9c6e---vekuwugigipugawekefodupu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bed4bc152---xunutobijatotal.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bab048cb1---85760758151.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf33f6375f---42446076441.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/35763295454.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fvuc9jvn4p4lgvv7p4jna0u905/xubibovep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chuy%E1%BB%83n+file+pdf+c%C3%B3+h%C3%ACnh+%E1%BA%A3nh+sang+wordPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 26204 bytes
SHA-256: 968be7c2fd37a0c2b7a10cd9ef56b530bd45e1c4856b447f5f32fdfc9023fcf7
font_02_sfnt_off00014a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A76 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00015328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15328 16520 bytes
SHA-256: ae827292910142fdac0d27409b74af87d9c2e0a201394634b27073c88633bc05
font_04_sfnt_off00016a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A49 11804 bytes
SHA-256: e02e15c1863f2e25793cb8f0bb790f8c62794b7885f0c4865749e1574abd039f

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