Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e902066982fb775…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 23:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edf73c48a58edb83581458f37c7db4fa SHA-1: fd151cb6040e4fe0798c698b0b6ca4f4836164cf SHA-256: 4e902066982fb775c446bf2553b6604c2d97b31c13034da897eead322c7a359c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the intent is to lure users to phishing sites, likely under the guise of providing academic or technical documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://chcial.ru/uplcv?utm_term=fluid+mechanics+munson+7th+edition+pdf PDF link annotation
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/limawumunukibusonu.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090112125680554.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c8ca1853---xisulavavoxarepofale.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/pemaselav.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/42685536916.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/visogewupugul.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210906_122019.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210915191139.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/jalinolorakenil.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bac5dd484---459797729.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d1efe6d08920e7958d04d9867db4dd3/fatiroxefurukonanitir.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/50726245380.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/rawolomimapokixozidorobuf.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/geweximimusudemejomopifu.pdfIn PDF document text
    • http://esejsc.com/upload/files/34942024430.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/33627769345.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/kamut.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109091111191354.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/zoregomitenopiwazakewiga.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/85927617169.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/wivetibirofudalix.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/52684171810.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fb707e8ae891fc28d536235f594535cb/8097773179.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/90943878847.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/wadezututigotugubeveluda.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15326634684.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/78326667489.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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 16180 bytes
SHA-256: 8e4252852f7a88a788e2f016472232d08243ca247d5c934b262b9d71f8be0d7c
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 10912 bytes
SHA-256: 44f3a28ac72b1eb6534f53b8936369ca1743773e469aa34916237d83e72e37bd
font_02_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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