Malicious PDF — malware analysis report

Static analysis result for SHA-256 976dc9a48ac7e9c3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 06:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 701815c324792df119dff0161095aa31 SHA-1: 68033f38a920577cef45d1737401857460ba29c9 SHA-256: 976dc9a48ac7e9c314d038d16941e39b8d7056debce6d5bf15794795cea03eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is part of a link farm designed to redirect users, with one URL specifically mentioning a 'phishing' context. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=six+thinking+hats+exercise+pdf PDF link annotation
    • http://brenna-ski.pl/userfiles/file/luvaxifawabijumimuzed.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/nefadixidomiwunutuveze.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/putuwew.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/8924514008.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/69519367737.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/56994303695.pdfIn PDF document text
    • https://ferropula.hr/files/tepekopirogiru.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/30873329935.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412cb20269e---37427132319.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889b9ab220---talewarusomub.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/mamatemiv.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15353356223.pdfIn PDF document text
    • https://123natura.com/stockages/files/33792672557.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/dijokurisubedosip.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/19952973742.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/86003949910.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/32005556961.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/bezegizuzalubuxod.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/mitopejorupafuveke.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/34072602752.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sizonaditubazokixixevugaw.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/83680260010.pdfIn PDF document text
    • http://kcharp.com/ckfinder/userfiles/files/9600870759.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fd988cf2---85237992420.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/72918594480.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/guxokoxakikajubizolubat.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 18492 bytes
SHA-256: cb92505f287f130335ec35339a986ac9999f8b40418c47261d10dde03615417b
font_01_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 11004 bytes
SHA-256: b93d96557c7aecac827a750dfe76633d433b2b127697e010c004af56cb75cc04
font_02_sfnt_off0001376a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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