Malicious PDF — malware analysis report

Static analysis result for SHA-256 571184f1b0b35092…

MALICIOUS

PDF

84.1 KB Created: 2021-08-21 17:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5391e8f125271782376273420611340 SHA-1: a81fa098e9381e9519684980c695b03496883934 SHA-256: 571184f1b0b35092d0aa2fcb3dc9b516efa5f6956d91d58d881f4bdb263ad5f8
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of a 'download button' heuristic further suggests a lure to entice users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=indian+air+force+x+and+y+group+age+limit PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef38c5f2e6---pawajupadukibikezizup.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b86783187d7a5ab3a85ae61a58fb8993/pizexozudujumowurosex.pdfIn PDF document text
    • https://sce.tw/uploads/files/60d3e68aa9af5.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/goninelolepurubisetetav.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/xadomalal.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/dezemiz.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/lasonexuwemoxamepot.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/naninomoxiwoziwowadiletob.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1318fc4f9f---futaxubutozutikumulaxup.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/gagujobivaletipeduzawu.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zeratesemisikuwopuvote.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a334cf12bcf---80924375301.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/zadamawafetenev.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kn1hj4ue751t1b1dnd0hbgqd03/81108533722.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/9370068523.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a041e9d1d9f---16669117883.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/19a1e3ca84eaf3a7ff2438b2aead69d2/dibebifotofinenonefik.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/73950078045.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/65688749923.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/98687723627.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/paxegagone.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6rh36b7e3jpbtbgeiebkfcda00/62888524452.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb40f9bc8b---kewagubalakupim.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061918373473499.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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 11064 bytes
SHA-256: b50dfa4242d7be27e6e962bc488134ae942d040277ee624bcff9acadc0dcb713
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 17760 bytes
SHA-256: 363879ea393c0847e83d5c1e5fd49f34b5c6df34c795a972dfacf53f886809fe
font_02_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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