Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca856d8c317d47b…

MALICIOUS

PDF

59.5 KB Created: 2021-09-22 12:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b4d71effae1e46ecbda60f429404beb SHA-1: cabd3dc501b42709a3ccff14d57f557a356bb2f4 SHA-256: fca856d8c317d47b0fdf2d7260311cae9255314ed405cd0eb3db755ac42f7f0d
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Some of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an intent to lure users to malicious sites for phishing or malware delivery. The PDF document body was unreadable, but the heuristic firings strongly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3255

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=class+6+social+textbook PDF link annotation
    • http://palami.by/images/file/vumisutawulifob.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/51134837128.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137d96dbf240---43500110784.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_DEDCBDAD7030E5CA.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/lures.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/tumexizulelinamev.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/fuxuvit.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/59871526075.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tidumumejizok.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-21/20210921120303686153.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/pavutodevaridabijadibip.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa4d17e43---nekerakajile.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613038c93712d---91012007506.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/21307448842.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1243620585613ca029b1bc3.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/fepevo.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090714001173499.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/8645207704.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/janoxefetunuzozem.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f5e7e963---70406480211.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210902231700.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fe222a458---71634647387.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/64875023990.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/mawaw.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/34215291067.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/nerazojeviton.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/56350712480.pdfIn PDF document text

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