Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4ca33684b8e60b…

MALICIOUS

PDF

84.8 KB Created: 2021-10-10 21:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1080e913b747cc18d43d638944017366 SHA-1: bec5ec30c4f333958f6d5c2ddbe45b9c3151fd53 SHA-256: cf4ca33684b8e60b8c5fef7d3c498dc0a0f27ec77f7237428966756514524c49
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of a link farm on disposable hosting and links pointing to compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sergiomauri.com/images/file/rinisebididofikilu.pdf In PDF document text
    • http://argyleliquidations.com/userfiles/files/rekim.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/38691410230.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16160c5b5b79c7---fomuren.pdfIn PDF document text
    • http://aaaa.handyfriendship.com/upload/files/98756906962.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/75538651843.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/tilife.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390dcb206c8---11592554866.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/feluwudosevof.pdfIn PDF document text
    • http://langyupharm.com/upload/files/72807589558.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161449955f1677---gonudesamerenazufopelarul.pdfIn PDF document text
    • http://ustunongel.com/image/files/80447006886.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/dilibizazutumikijazipu.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lidizuwuwanuzuraful.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109200004081966.pdfIn PDF document text
    • http://balone.net/_upload/file///30327604321.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161541da760b90---nofinixebevafirunavixe.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wuzesivuzokawinizogirine.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/59748278943.pdfIn PDF document text
    • http://getdol.com/page_data/file/19397995572.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1d7c40ac---tibolijunabirodosebuti.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912211523.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/4615454426.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/zomunikol.pdfIn PDF document text
    • http://scpt.it/userfiles/files/30699191864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+free+java+edition+for+pcPDF 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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 19556 bytes
SHA-256: 8741909a2b2cf67ccb022b46797bc247d22ab601bd18a76485324b72223cd074
font_02_sfnt_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 10588 bytes
SHA-256: c0170424a70acad2ae908f83d5bc0f366992fab800a4c5be58fd9db743515993

Open this report in the interactive analyzer, or submit your own file for analysis.