Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8e615abe12114f…

MALICIOUS

PDF

75.7 KB Created: 2021-08-01 23:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 720301118956376816c2743c7c4338bc SHA-1: b6adbcdca7c7c4df3dc48118414dabfdce377d61 SHA-256: 4a8e615abe12114f4b3283e85b0d0b72cba5ebe4fa449ef2b8790919b71148b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=madden+mobile+coin+glitch+2020 PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a151f35b232---zudizemuvesofisixepov.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/43360080158.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/mobarivulofutaradumam.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/31263522004.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb68cf3cb---zanofagivupirofupokegekil.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/20869053566.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/68161284733.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/naritonefa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609465031a9bd---fetamonulepowi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcaba2e60---majurulavedipasezofiz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26f07832---damot.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/fimijekuximez.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/16207487130.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/37193711287.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/tamazub.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/75247664329.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-22/20210722184722886875.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/471563cc9ac1d080308d804cb200439f/vutofu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l57af8hmjm0m9loraugmt71k53/vuselawemozevejexobotigos.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7e4403c09b526132f52e30ec7268f884/mawog.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a752e54369f308e35da502e33ea2d8bb/43432634088.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a849d132ad7cbcf7acb7db577015be36/lofamerefimiferaz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854aacedd6---botunonukeniloneze.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/besadawigij.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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 16604 bytes
SHA-256: 996aacf02f1f9fa01723e666df807cd4c0cbadb501fda2b115910957f3f6f768
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 10924 bytes
SHA-256: 093d30e3c6e51f1be77f79a954cf31ca6b52f5a88b260fd0c2d8a9de2208b908
font_02_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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