Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c2e215527d2b4d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a0f04b721a1b02dac2cf60cb440768eb SHA-1: 0ad37078e8e18e7b525c6842b8501ed64b4ed234 SHA-256: 23c2e215527d2b4df07c5a8c2d94d8cf04061d7aced6bb2c583d32a944e76bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://car-zone.sk/data/data/file/jotutotuteluzagalasaboki.pdf In PDF document text
    • https://digireg.nz/upload/20517274185.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/folixamovukazek.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/segajuxajowabunodekev.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mp8upjphjd38tmcchv27fqs1s0/xiduk.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/momudigirunubefiwenusut.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f612bf0e4f---38069666334.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-2/20210902051112414920.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/bipixexoginu.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/32721091045.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d280dc2ab---sozuxobonifukanuveli.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sinujevofutunov.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf2acbabf---21840962088.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/44835286234.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/14488411782.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/20251362024.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/22300054452.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133176796b13---kotunelijunabit.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/92d7201b1c45d1a190e51d09408da3c7/mebuvosadutemewegox.pdfIn PDF document text
    • http://asqcert.net/files/files/rukesosebirelobewiwunejej.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_154820.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/miwuzod.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/xobodexazenigipowega.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/fexifakurakoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=matilda+ebook+freePDF 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_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 17568 bytes
SHA-256: 68bda88065d994cdca3dbda8f9dd3275cf02941c896249081bd2e07481921453
font_02_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 10300 bytes
SHA-256: 19dc96f0f5e10e53ed556458709d538a17571eb5c2f5904a2df30c2aaeaa09f7

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