Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a36160d90edd16…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 17:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b00522b20fff2361e0735d10d000889b SHA-1: 6a02e48c23dbd12ae66526f09d653e25fd61f38f SHA-256: 29a36160d90edd1635e161f13921f0251d1b8eb63a8eecf10841139beeeeb128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://huntic.ru/uplcv?utm_term=gangstar+vegas+4+android+1 PDF link annotation
    • https://bakotech.at/uploads/ckeditor/files/bixabepumazodaxe.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/39661932451.pdfIn PDF document text
    • http://tion.hu/upload/file/90410956719.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/htp4bajk39hbu1j1tvup6nj09h/xalifoju.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ohe3cvj7r0hshacnbhuf7smqn2/16563043898.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p3mmpkak6b887ktv1scp5khlu7/galebexaremolebera.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/xigedererenujupiwa.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/viditarebelesaxunarixeru.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xujuxedekomi.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/wetebogarozidovefubu.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/rigomewipelaketidugirekoj.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/ladigef.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/7510007227.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301a7d39039---papakurivemes.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/19325290983.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kumilavumuxonabeke.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/joxemitev.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/29226533670.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/nadifofijamobobumebeji.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/vojututotobu.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/pitukusulosu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d58cc3ea3---wuzowefibi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5a78979d---vofepufijozipinozafaso.pdfIn PDF document text
    • http://azizolace.cz/images/file/4920148779.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/jijuxejudekokolem.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/vodexowulomefoloki.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/mopagolujukamuzole.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_off0000c2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D8 15560 bytes
SHA-256: 34f812558eb24075e8f1da3f8494570dce113c7c376ac50e0f9a237ff3cdbca4
font_01_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10612 bytes
SHA-256: 28879e1cf1e92a815444f3dcacc75c3c048154eccce66fdad8039beec875e645

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