Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a45537a3467cfa…

MALICIOUS

PDF

153.2 KB Created: 2021-07-16 05:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a34237e4d8305228ced408c26082822d SHA-1: 2e4d227de3b7e28be2df9a2a59073623a10ee5b7 SHA-256: 33a45537a3467cfa93816e8cd87e935a66e9dd3a1d134965f7d5acda686ec81d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://mazurubezpieczenia.pl/zdjecia/fck/file/47449885507.pdf In PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/33220075051.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/96151125536.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/26007892888.pdfIn PDF document text
    • http://rotang.net/userfiles/file/74207814004.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/dc6fvgodd2s4ls2rnb79brhmk0/29038691429.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/24965672666.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/kulurivajis.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/16aacd865c53409c76249766fd3f04c4/30724715632.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/suusb5ndcuaop67bvc7d23ogt3/12408692905.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14ead9c46---79162929196.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/lduntvc9t680cjcl7e4phvgcqh/50632108047.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89145221312.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf713c1740---95337097253.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/46060651410.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c22eee238ed42f27cd5bb1c98336da78/86520707905.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b660435b27---91044298163.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/590f6333cfb8aebf636f4857b100d163/18726397680.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/wuzikomifiwojivirovikumo.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/68223560910.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9b2f0a912aa7d4af5fed5ded5d54f012/80004772574.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ij5focmqv9ca58brml75e3jd4m/sibovewanifazutipet.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160effc21ac32b---vatemusefalubiwukajiwi.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/19/file/pajinafasezujutasuba.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2455e42ee---doxemudazimudepirinubuvi.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/53660877715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=data+modeling+interviewPDF 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_off0001f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3F3 18808 bytes
SHA-256: eca964ac1a8787bd684ad31f7df671fd9576bb9c071eb8dcc8a762982903bfa9
font_01_sfnt_off000225bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225BB 10576 bytes
SHA-256: 6fc1470adaf4987ec41fc91c5888438ecf63df330822698732875c0cd8651138
font_02_sfnt_off00023da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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