Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2936c608e841f6…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 18:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29abf68c58ba8b7b62d43705d4c81678 SHA-1: 7c0119858bb7504d33e3897b526fec7d6abb892c SHA-256: 3e2936c608e841f63ca91497315082b010d8efcaa5b41a39f0f0564a97d62d61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://embassyinvietnam.com/webroot/img/files/fowomavirovalinalina.pdf In PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/ruxetusipu.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/vawotabifajuwob.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614142c87662c---nejufanu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70beb63a4---28324798636.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/12690163738.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ois67i4n55c41lfrvu672m0r02/nogumusevamulo.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/fukekubepulewozazesokelu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090901101852.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/67293914804.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/laropibevatirofobiv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161311ebb866b8---gosofimuvozelujekureri.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/3860144075.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/35064117465.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/38895727545.pdfIn PDF document text
    • https://aokman-drive.com/d/files/tutemuderawojasawemij.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/delibamubabugoromevupotow.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/31442481137.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zagizizomijubamifirex.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/jagagofakarigabovosewagef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+hero+academia+season+4+streamingPDF 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_off0000b4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 10956 bytes
SHA-256: 911a3a1c62e68a379f2816ac3eb2e87c10177af1b586b2dcb0f95f1bd01eba19
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 15744 bytes
SHA-256: ff336629c04b468514115013021a878d66c0dedc0cca147a2057e76ec7f39c38

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