Malicious PDF — malware analysis report

Static analysis result for SHA-256 52582da2b642cf32…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 20:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fba9eac86f626eb3c6e211e538414a97 SHA-1: ff85f8953fe6e0f06b998d0acea3977bf8ef0194 SHA-256: 52582da2b642cf32bb459069ed531e6ac2a208adb491585a89cd518359c552a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable or potentially compromised hosting. One notable URL, http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ee47fdc416f327a9dc1849f472a66f03/72448324455.pdf, suggests exploitation of a WordPress plugin for file hosting. The presence of embedded JavaScript, though not fully detailed, is a common vector for further exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixuzojojibosed.pdf In PDF document text
    • http://essiac.cz/UserFiles/file/sumepawasanopadorep.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c5ni4fm4vmmcnl3nvjd0s47kg7/80757172263.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/33251437614.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/54346267689.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021614525413538.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1207595205611890cc25935.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/80665666809.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/umcsl6i090lfhudgbdk6lq75qk/18043495906.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ee47fdc416f327a9dc1849f472a66f03/72448324455.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3f890c9effaa81ab541353d94f5f1351/jusixizanu.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/86071332207.pdfIn PDF document text
    • https://digireg.ru/upload/83503913441.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/15289568134.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cfdebb691---45778956919.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/nutudefodumefemurosuv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/372a83b9089e97360019bdd989f7d8a6/faxidenexufabolulovejen.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/11210856754.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/viwewiwiwijow.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/pefotigigipojo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tojavutiziwower.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/97775096747.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/61883643928.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/kamuvijexurowaku.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/45014757738.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd699f1ccd---mapemulidewusitibe.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/19602086687.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e530b0ee2b---54185047240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=exercice+champ+lexical+cm2+pdfPDF 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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 18876 bytes
SHA-256: 275c67ee996323b5848afb27e31689d003213ba4b5e0dbb74a5b1d9d1f713c2f
font_01_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 10600 bytes
SHA-256: ef7de553f6121525d62fc07c2f6ecf0df3dfa2da12cf8bb6a2437fb6e948f179

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