Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f60b16731d6cc19…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 22:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7098c97132af41dbc863fb9a7dc72f99 SHA-1: 42cb1b79adecf73e7d9b17332b87299f70545a4c SHA-256: 8f60b16731d6cc196270a10459935884404d9cfdb17b62e1edc6e2a1e30ac366
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the detection as a phishing trojan strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b896dae9829---45979141245.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075489f5d9dc---64945640142.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/46728641781.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/35587321252.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/rtk7pkul11lepq71jo2ne9ngu6/vesobivefivukor.pdfIn PDF document text
    • https://blugarden.eu/file/gamidalapegibilivim.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a5e8004ae1c61582c0f97a6e3f1910fd/zojon.pdfIn PDF document text
    • https://combrooncom.com/contents//files/19178753510.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rajidopisuxazo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609173d63724c---67737611050.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/nosiferaxinopokuwepi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a2cef4c73ee983671fe1c1d91b0ce57d/jumanumewakiwu.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fubobotevuna.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/lalixebavenixeju.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1011d678---78254518659.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/9817502208.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/47667679666.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2843c014---vimofaf.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51ebdda407---bebemerewipejozuv.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ace57bb3c764f5e8f738355f08ef1648/76751650059.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/zajur.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608679b5eb435---kapodezitevebusujadi.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/ruvudixukij.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dutaverafuxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+de+numeros+romanos+1+eso+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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 10904 bytes
SHA-256: e2d7f98146dbb7001ce57bebfa5f8c66216d58c693c69fac2217daf4e138ac02
font_02_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 18896 bytes
SHA-256: 69e7e7d5762b954ed23e9f9ea0bd384797f5fa96721da5a372187c9325c5b9fd

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