Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8ca4bb208e15f4…

MALICIOUS

PDF

89.0 KB Created: 2021-09-08 04:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fef8f035b7606fd7d92b73fdb204ec2 SHA-1: 16418cac23db49114489e338cbdc06808cf1c443 SHA-256: cc8ca4bb208e15f464123e158a5dc05dae5c14e474756c3ecf3090b5ca53c33f
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute further malicious content. The presence of a 'download' lure heuristic reinforces this interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiobaliva.eu/userfiles/files/sedidimaxivawijep.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778633b018---kuxagi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e42abe600c4a2ffef3d09964c8e12e3/losilojetumedukuvokajon.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4458a7216df4a56a3e7f0280648ace11/13012746922.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/25822015121.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/og30m86d8m6pds6aibmbn0jrk5/74517211995.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609870c88a25b---kozusa.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/17625726293.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/tifigufonosusa.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1ea3c90a14b2f37c852f293d42cf6957/73643837196.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/vosakujalilababuvo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n13ppalgnfav3lrtfcbm0hka35/bolinu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/jonadogi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9552157c01---16213408331.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210701_051739.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kv1g65krb5fohfkl2gdfl0e1g3/kulupudofejiraz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4df2c0ad91---jegukugifa.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/guvedufizuse.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/slff9jqvu4plar098sn698593g/bavipumatogosanopirige.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/79585925477.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/7337056768.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/15ff93cbe47c8bdaaab681e0bb2e6235/jaroxina.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/naxuvetin.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/poxejutuvomunapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=casti+guidebook+to+asme+section+ix+pdf+free+downloadPDF 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_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 11512 bytes
SHA-256: 0688f3805c7998f2bd4f3f52e0e0f854a72a1693d2b39e12dd64087fd0e34c3a
font_02_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 17564 bytes
SHA-256: 285809f54ce1452d72d53cbf4e4eaa3a72160237963c8424c47ebac4800edd26