Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb61adb091ce87e4…

MALICIOUS

PDF

89.9 KB Created: 2021-07-16 21:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d670cb1907dea8210b0885747651430 SHA-1: 765c4b526cafcfd898847faba2405a6b78e5a070 SHA-256: fb61adb091ce87e4c681ccab5b3dde8d527feb759085436332eab15f199dc20b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The ML_NYX_PDF_MALICIOUS heuristic with a score of 0.983508 strongly supports the malicious classification. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://ph2020.org/FCKeditor/file/fitavoxugibasag.pdf In PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tilomogopug.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a056892ad9b552f711f25e067e82d20c/dubokajifegij.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/lukapumugomuxugagowetefu.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/zolabanevemovukejoluriwa.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078375c7afdd---zakumisejigozilofuwi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de93f6b8eff---ripagopizijutel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee569d0c6cf---widexirajikibokorewibebes.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a725ce07---28794846648.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e1029400a0eb9ffb32369fe6312adffc/wasotukiwugo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jomasinazuzafib.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe9f244aa---60219659464.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7fe2bd256c666981af32de15ec74bff6/96711217707.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/41263557253.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5d6103fd3f41fa52c7b26ef865205517/64373668804.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4e61ab5c3d70fe8bad977490a496df86/70071612398.pdfIn PDF document text
    • https://isosklo.cz/uploads/zupokilasirapemabotikuto.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ba1a3304d206d18e08630d9086ad2ae0/65151955179.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02456792e---nererolileberuxalifumun.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/44651219059.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8424dee273---dimusoletelivevik.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ec4812c15492c065a12ef1c1e9ee3c3d/22408005466.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/33996945752.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/mowok.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/gc9b3l283aidguen3lgngp4dkg/nipusag.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf3f56f9fb2d42c6ceaac34ee812cb2a/5302194343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hey+you+out+there+in+the+coldPDF 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_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10340 bytes
SHA-256: bce570011b8efd597411c9c672478d6b17a0a7d22e8ba385d94fb2c3fa11b927
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16448 bytes
SHA-256: 18cb3096031e893684b369e31819260e5cf50411fc8c1c4781fc0cc59f5a3e3f
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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