Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cef1e426a0097d1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 00:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df97c37d3a6a40a2361d4362b68efcd3 SHA-1: 8d793c72d38c86c1f39c047cbfe2888c04e1c521 SHA-256: 5cef1e426a0097d1f57b48bcbd09080b69d237a31a5748afa132b94d0e08f828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=pes+2021+mobile+apk+obb PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461816c2a00---22890382927.pdfIn PDF document text
    • http://seritour.com/rsm/files/zetowebubekak.pdfIn PDF document text
    • http://geoman.cz/data/file/64194235071.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43461679439.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/38047770239.pdfIn PDF document text
    • https://mikludava.lt/images/files/juvewekedodisokidavabi.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/72189756579.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fodifaziwevaxidoperosus.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/koxusozuru.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tijalonanekerajamob.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/12453783720.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109160959479496.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/buzewanaxumerokepup.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/ludimulowamaf.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138873525ba7---96073674191.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rpfsn7qrbu2ik60lked6lu8vn6/78109783985.pdfIn PDF document text
    • https://tsegypt.com/file/45579272220.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210917_AD765C87D0BAC8DC.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/loroxajuroserasi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/5099357698.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/xodatuduzulavefikug.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/supixedevad.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc10b39fa---belejijoxidemaka.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_off0000b7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 10640 bytes
SHA-256: f7bf3be415dd354c86fb2165ba6227d7fe8f40358a43362cdf30c1047dbd2aae
font_01_sfnt_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16544 bytes
SHA-256: cd54e9de7713c2f1c666626afe8d3a3246a15868d4faadb8d3376a3a1982ade6
font_02_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1