Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad1831af35f8ab5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 05:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63cf6bd9920559840dc5c58816a10041 SHA-1: 66fc295e28c8e4ff4b8e28322d87a870d589c42f SHA-256: 7ad1831af35f8ab5bbd67a7ac1b543395041b3463e9512049d98eea048d46fa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs point to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pixomot.ru/uplcv?utm_term=what+is+text+pdf PDF link annotation
    • http://demkapi.com/resimler/files/wibukugadazuratigo.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vedorusu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/xizoxabovivaz.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_C7F44DA28AEB7257.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/3274474681.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/xevupozizumevena.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/perofenekeguwelesosib.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/fubugozifonokog.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e66eebb09fbdd4d2bd1b06064a87fd51/jonemimomujuwuturote.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909203725296319.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd7cb10d7---dizaxoworiduzejesu.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/32571579352.pdfIn PDF document text
    • http://centronegozi.com/public/tomolesikipivun.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/werusufirusebokaradazalu.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/26475133751.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/65032217738.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210901142958731.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/30982443895.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9859d6367f2306a4b870b443b7cd221/sevotobezej.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/41033963120.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/jefamotuxunaz.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7a308318c446c92f760a90795ff20b9c/mafewozujapolilevukif.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/1764737508.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/dapibakazojutitelisabe.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/bukigalunopaji.pdfIn PDF document text
    • 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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 10320 bytes
SHA-256: 0413cb5eac6176e340f3996d05051e68ec8427cbd050e418ba2443e1fed353cb
font_02_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 16912 bytes
SHA-256: 5670333ceb340f405edb0171f02509c42ba29098feecc26234f8cc4d47f6e158

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