Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8438f9903b9b573…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 11:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d049fdf10532452e4605808c0c8f864c SHA-1: 7030e2bf69b3a5b6d02bcc64b8a2cc1958dbaa67 SHA-256: e8438f9903b9b5734ffa7ac89f7746a49d60721da0cdadc8d6fad9105260e69c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=ancient+aliens+season+15+123movies PDF link annotation
    • http://dierenwinkelindex.nl/images/uploads/kowerirenuxegapurapexire.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/12420022785.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/movabutazenoboteja.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4fb6c513---17229811562.pdfIn PDF document text
    • http://balone.net/_upload/file///58463128186.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/11212709189.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/levota.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/26383582583.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/6405913539.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/211f8420399339f64dfaf4ddd5ccc4bc/wuvaxex.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/80317878819.pdfIn PDF document text
    • https://agatanorek.com/files/file/4341123521.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/felagosadef.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5207b5f69344ada2621ea49711f2f173/50698995510.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/koromi.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///gosavimukulub.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/nomedemasavodowamedaja.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/46422932086.pdfIn PDF document text
    • https://alev.az/userfiles/file/68199111053.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/59614607972.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073a0a0e97---70862340188.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/24198243142.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/samizeridupupawukokap.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/wudiv.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161411d86764e2---lowatepelosagivasujude.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_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10816 bytes
SHA-256: 332b313291ddf5d51657bb01795ca0509dd2b387c8d8802bf9985e26def5e01a
font_01_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 18728 bytes
SHA-256: 3bd8f19ed2fe0874d2b76c75c5216fd0d43159d1d16dac9ba29906d7a6ee8922
font_02_sfnt_off000139bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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