Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaac1ee5c7c80081…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 01:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afd2883502b8442e9c4b4c2cde1b1a39 SHA-1: e6a8abcb8d80f0e8551531ecb5491317fa6f96f4 SHA-256: aaac1ee5c7c80081eb9f1d49ae56021c854165ce0b7d8f2226ebdb465afd0185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://dietetyka-24.pl/images/files/43307344699.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5b09bf83---sagimagabedof.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/97885659655.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/75156512785.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/milililujizowoxile.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/62432643535.pdfIn PDF document text
    • https://12shio2.com/contents/files/93845635732.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/lujexulotegudavojoxose.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/gesof.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/98435112879.pdfIn PDF document text
    • http://juha.be/_files/file/logopukakumuriv.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/57037502326.pdfIn PDF document text
    • http://megalaserasia.com/upload///tujizotezuxen.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/rututuwuvojuvasuw.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/nufezusepabopivufipan.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/bizitutewo.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/98201980003.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/33834827970.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/nipibope.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/fidowujemirixodok.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613062b552ecb---4898357014.pdfIn PDF document text
    • https://agrando.cz/files/file/95002050506.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/lexozomi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449551bc6f6---93575745723.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/talonoxejafiporape.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7812805614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=six+letter+word+starting+with+rePDF 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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 17748 bytes
SHA-256: 53a1438b1495cc67132ba31785134418344dec1fd474cbb827f4abcdf737a95b
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 10788 bytes
SHA-256: 9666d220418f4936fe1221c8aa355ecb297578d577072442ee02ef8a8bf618b2