Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a8b23bd5433231…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 01:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00a328f6c93be35f7687dc72897e9b98 SHA-1: 71f8f86da32c7a9205dc9436cbd5e126476c6bfe SHA-256: c1a8b23bd54332318ebd0cb2a5f26fc4d0810c2e1c14f9c1b691b7e536e96258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=fighter+jet+games+unblocked PDF link annotation
    • https://menu2uplus.com/images/file/falerexubagitivaxuloti.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/12811365826.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/75933614864.pdfIn PDF document text
    • http://telektrans.hu/editor_up/ruzidivojiwokakol.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/82287018362.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a172ee3de7---48898688117.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/46059331460.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zotasubonen.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kabesatemibotivavaxi.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/68110810536.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/15383734944.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6af5420094f24ce3393a38e33d74c59c/watatexu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/refaliwawuxumatobivukosep.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/bugiguvulajidederupogizu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zixogasekamu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/53566915738.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1241235bd137dde8c9d284301d3076d0/vuwasoduxakizoder.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/6353008463.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/gudosebotogesulitapewe.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3aee5176c---libovawebulanuneb.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/xupiv.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/lekofubixosuvir.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/23547675215.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a1406dd1---vubizuboziwudepebevulokav.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/sazijelerutifemugegedij.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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 11256 bytes
SHA-256: 8718a32d457bfc3073a538b1007c33522df025b64b1814e4f9d25a70fef7719b
font_01_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 15440 bytes
SHA-256: 6272a4fdac0c693c126a156640be69fa4c73ce77abbd0f9dffd7885be71e0496
font_02_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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