Malicious PDF — malware analysis report

Static analysis result for SHA-256 812e4904c668c28b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 05:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39faa9ebbed7df6d5a4bf9624a2939c2 SHA-1: 35249339e0a63fbbcc3660dc9c29c4fa1b740ed0 SHA-256: 812e4904c668c28bbb0b22ebbe9345f3b932d9347a9f9d8762adf706aba1e3ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggest the document is part of a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a seemingly innocuous document to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=tambalang+pangungusap+worksheet PDF link annotation
    • https://nada70.org/userfiles/file/kakiperazatakewizu.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/tidiwugolawinuvegatabe.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ojue6h9agfo6b3cb00vfj4p3fa/94170914447.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1p7lihlv29jmdeeuc8ski4opom/72007211262.pdfIn PDF document text
    • http://poiskvod.ru/images/file/zikuguposokimox.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gpds110adt500i0e2hkha19t54/kubiwagomogimejobap.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/wefexodidedazim.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/rilifusoj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c362e606871---26619867430.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/52022699460d070a753b16.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430111316389920.pdfIn PDF document text
    • https://edusfera.pl/upload/file/19805487247.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/rudexu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vpldput793len4j7ld28ar85b5/vorerale.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d20beba9---48769063078.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/21274604904.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/33056664111.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/merulizibep.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080b693ec5f5---xusujado.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/jufaxebisosekarujid.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/36174363974.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/sibafajakezatifaso.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/39856186920.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/76925391270.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b390945038ac5ca865837bc8ebfb542b/13381060943.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/10545453970.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10988 bytes
SHA-256: 81c0bd8aa93a50a7aefa38626de1d60eea3f8beb810952bf7258be2498f0a065
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 17104 bytes
SHA-256: f92efaa64f9c2a9b1b2381bcd8eaafb494da6bbe766c76c1574ee6dedf52e9dc
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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