Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4c2ac947d13d93…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 01:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f56bda2e8b64c0e0bfa19a7d27a8120e SHA-1: 80c4223934318af0912d380ac988dcaa755bf6bd SHA-256: 1e4c2ac947d13d93d5c3eacfb96f16fb463d56cdf365f625ad1ca4145ef00a9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM, pointing to a large number of external URLs. These URLs are likely used to host phishing content or distribute further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=can+you+download+fortnite+on+a+phone PDF link annotation
    • http://geometrarontani.it/userfiles/files/bajinajen.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/2761048943.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/51700698212.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390b43535b1---wizatamavedo.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/xevoxiga.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/94141363538.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/94119514989.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/rekem.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/42384197753.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kikukafotajikosimoxinot.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/defopebokibavinarupaxej.pdfPDF link annotation
    • http://trongtinpc.com/luutru/files/2522681852.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/sajefope.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1e4d862b---jelidi.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/zakowewudegotix.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/15893495172.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/87167266036.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/lidoj.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/37417024660.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/2885954865.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109101224119291.pdfIn PDF document text
    • https://auto826.com/uploads/files/84851986344.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/zubibezadawagajamenidu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/sudapifufotijojuladefat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384bcdd185b---tupopem.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/palopumotuxel.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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 17508 bytes
SHA-256: ae58a106c61b016bcfe02ec56b8b9afb5f866d8c623f25a15e4fb3f7b6e539ef
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 10760 bytes
SHA-256: 44ff5c2884149cd2bec94f1ce4c905b9c044585f8feca6c075f01cefca4f9080

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