Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57eff66d29fbb5e…

MALICIOUS

PDF

99.0 KB Created: 2021-07-29 20:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1434f43f9d6b6f987712ffe6ba0ff40d SHA-1: 582c42c16baaa3db0b476afa77cc72b299ff6666 SHA-256: e57eff66d29fbb5e3db21ab124848a86fab2e74862805f233e8be0b99a3d51a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dragonspond.com/uploads/files/vizim.pdf
    • http://omonetach.pl/foto/ilustracje/file/wokebu.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9f2a9657915aa7bff6657c1d95cab753/63111024284.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b801c950029---fikaposisipizosum.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/14004b0c8ad576e8d13efa757cf146d8/38844825290.pdf
    • https://veterinarycarefoundation.org/userfiles/file/najoxafemufebobe.pdf
    • http://atek-ent.com/upload/file/29215632660.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/9d85c257904b03b58f2e5fa72b3975ac/87453108718.pdf
    • http://knuhpharm.kr/userfiles/file/20210626040112.pdf
    • https://carlojans.com/cms/file/fadijaworegipe.pdf
    • https://acryl-bg.com/userfiles/file/gaxupibugiwojaxubafuka.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/pozisurimilem.pdf
    • http://turagent007.ru/userfiles/file/6145711059.pdf
    • http://zulassungsservice4you.de/bilder/file/bumexisiz.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bea16e1493d---96781737770.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a300c1136f9---zuzaludojudobosusefagix.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/nutajitowiloxojetudita.pdf
    • http://esthebel.de/userfiles/file/sumadopumemawutunogoweg.pdf
    • http://antifftech.com/uploadfile/file///2021052113154810.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ptv6d1pbforiu1l97tf94lna9v/mevupefarepebi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a0fba32047cff7e6af12f5a842effb18/5005841405.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+de+formulacion+inorganica+3o+eso+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011921.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 16792 bytes
font_01_sfnt_off00013138.bin
b364dae822c6e33ccb824a70f897c212d82f150cc7b8ca079223d0810d79d423
pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 11252 bytes
font_02_sfnt_off00014b51.bin
07f908a513982b44b9b3a5a07c08489007957205b8b0ced9bdb3fa337546a23b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 19228 bytes