Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf41984f00a17f4d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 16:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a8f30ef53e7843a3048fa7fda750d3a SHA-1: 7e559de08fa382084650b4cbcb03b30fce4adf22 SHA-256: bf41984f00a17f4d71cd866e1afcbaa1fe6c17d52e96fdcd020b318577655341
156 Risk Score

Malware Insights

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

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used as a lure.

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://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/gubotiwevutor.pdf In PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tizivo.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/faxabalapesafiwapasap.pdfIn PDF document text
    • http://vipdiler.ru/files/file/21474371916.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/bekalekuzemupozagozisav.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85ec339b4---natemadalakoxefutar.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/devon.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nisegajaxegefujugulew.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7ee9074dc6fa4853a3457f4eedfa5f2c/mipomisutevujadobamakuved.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/voramopeg.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2e843e99---fapopugolag.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sinox.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/64720461051.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53323258656.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109091116413658.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/52462623594.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/wumitoxolifosikapunow.pdfIn PDF document text
    • http://yibetter.com/data/files/gapitopepafam.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/zazivakajegigikukejoregom.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/nimudipilurezonepowe.pdfIn PDF document text
    • http://balalajka.nu/media/zademofoxunisapenijolevoj.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/satato.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/rejolulajixan.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xepapatizusanab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=music+rock+apkPDF 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_off0000c497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16948 bytes
SHA-256: 772bb1ab630fed863566fa4bbdaf63346d0cd63d66894094e33570c4c6659238
font_02_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 10172 bytes
SHA-256: 19fc01976d2dd844ea1423d43778b49a854dfec91b379b0ecca550be32907697

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