Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5b440557cf77e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 20:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5415ac7753f0fbd527a6a748a236a593 SHA-1: 537b020c1674379cad79cde3b5313759c2972427 SHA-256: 4fb5b440557cf77eaaadbddd45eeb9cfb197748955059d884f169693e805313a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=online+free+video+downloder PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405824cf34c---pikanijile.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/surozesijijab.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137104f5add8---73521630410.pdfIn PDF document text
    • https://12tiga.com/contents/files/zewerimabitisimuba.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/61365972516.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143f9b536e76---50738930190.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/zewofuvavexiz.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/kumumid.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/93624932324.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/21890437431.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7029cbd80---vovowajomokakejatufenubam.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/dupupevogobo.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/41205880869.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/wagubona.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/rasemogaveliguduwuxojazo.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/zekediro.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/43022908555.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907145921113.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f594774234a1db0ca2f5127497e5647c/83966577376.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/bijasexediz.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/31564779636.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/505324521612f614c4e470.pdfIn PDF document text
    • http://contelex.it/userfiles/files/57099136248.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/13117263159.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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 10096 bytes
SHA-256: 640cc87dd5aa0c0f71b0e4bffd0b93cb0deda09a86afd8380b7bcb820ac90691
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 16056 bytes
SHA-256: ef3807c100de4b1c5eb01c24892053f831bd3959f4b0180970584fbc38ca84e9
font_02_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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