Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca7c2157d740a4b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 03:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2877bed880b4ce568d9ab6aa69e7b5e8 SHA-1: 5b94bd2ba4a83ce04aba77cf2a94d7b54a5fcc5e SHA-256: 9ca7c2157d740a4bfcdb39a2eb52b82758da9bca79a88af470ba2a3b5fcb5354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly suggest a malicious intent to redirect users to harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://leruichem.com/upload/files/21376143822.pdf In PDF document text
    • http://ehoron21.mn/uploads/files/16479273794.pdfIn PDF document text
    • https://curvy.tw/upload/files/gudebepatebu.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/rizolon.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/57164522264.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210910224445.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/58959592499.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/93272132170.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e1583ecaad28dcf8c6554c16b6aba3da/tisunenobixatukit.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/5371575290.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/fomaxudibopenilok.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kipuwi.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/fukususamafafuvakatewuvi.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109042256413940.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/52460601257.pdfIn PDF document text
    • http://jonme.net/ckupload/files/sexatarujovupataliluli.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/21389372795.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/velomapifavitigi.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/17335191578.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/g887cfs3dgmlsq4pok46eakb53/69158356285.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/741175686.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53281368e---93363894730.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/vakoted.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210907073107767.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/19655931298.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42cc30c61---57776664118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=instagram+followers+app+realPDF 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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16880 bytes
SHA-256: ade4afc6a918e44de750487c4ab89f277eeb6df920536feee4992e3968067670
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 10648 bytes
SHA-256: 300d921d1ad27ce9d658ba4009b269a837a0386a5d854678b9daec26943d82ae

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