Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fea9a201c5581d…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 17:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 755f2d54dbcce52b668d80fe73546dc9 SHA-1: d4156395bbb81df715132b1a82ce6663007a3b80 SHA-256: a1fea9a201c5581d613c56e157a1eabf148ba6e64c522b78b7509fca196a7402
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external PDFs hosted on compromised websites, and includes a deceptive download button. The presence of numerous links to potentially malicious content suggests an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://coevent.ru/upload/files/9046294230.pdf In PDF document text
    • http://www.cddfct.com/up_files/file/45700664672.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/197c72f7edd9a2c27dee36e959fd0aef/55907790532.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rkbdkku85c7571ssshqmp74q0m/kokedegutejafagipaturida.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/risokaziloxanorubu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3e7d48e6---tesukonekuxaw.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3c7ac9bebbd56a6b91be3d6a035bfb2a/fagoxikexosasuwej.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/tuxokewekakadal.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/3412850295.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d38c3796---94692661206.pdfIn PDF document text
    • http://www.asslar.de/downloads/xomulutegizu.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/47982709100.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1f425ad6d28b79ea61a70883051b466c/fipomojutexesoreriwazan.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c010266af7e---purenevixufadalefowebo.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jemimuki.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/geperibixukamazafulo.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/gemewamenerov.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/epicl8ju89bnl8n6mi29lsk977/nelagokobenudofonazed.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8df2ae823dc1f893fe7fdc1d09cf5dc4/mazidobisoneperepexubos.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/teniba.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4a0bf0d068bc4a219df1c23c95a03bfc/1583091605.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089b788459c6---99640725331.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/siserurelav.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72edfb7421---14664161717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=antichrist+full+movie+free+download+300mbPDF link annotation
    • 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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 11408 bytes
SHA-256: 6d7e3ea71491c8d359669541b7c3a4afe06fb4a1bb2bbccf8d6ac684b4f37418
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 17232 bytes
SHA-256: 6d277fe9ae5c7745813d718462bea18fbd9f2d24b13900dee945e69fd5523ffd