Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a516ae9629e98d5…

MALICIOUS

PDF

58.2 KB Created: 2021-10-05 01:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4cb8e8f6bd32df7f42a7d17259de1ab9 SHA-1: 6019ac226a2bde89aed8dde9d3fbe07750b7978d SHA-256: 1a516ae9629e98d5b7d30b5b3c53ec232573d81eec4cab6695af738f5cf17749
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to PDF files, many hosted on compromised CMS upload directories. The presence of 'utm_term' parameters suggests a phishing or spam campaign. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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://pixomot.ru/uplcv?utm_term=one+punch+man+th PDF link annotation
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xatalupadizugo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccbb94e45b---28113439165.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/bosetadovupinuxodimodeji.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/gepelemofo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448e5c4f7e8---wasoxerefopabutiz.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908033544432.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/34091056764.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/wupupixozewonuxewivage.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/fuzus.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/2846925065.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/78381481358.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/70897754747.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/35464357308.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/72258426039.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/xupujurijigik.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/45892709962.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407aa7b1118---gapolofadobavowekenagokaw.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pifepanaxuzojuseri.pdfIn PDF document text
    • https://12shio4.com/contents/files/25046879208.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/27134736724.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/48595481814.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/75855594399.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/4938913673.pdfIn PDF document text

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