Malicious PDF — malware analysis report

Static analysis result for SHA-256 877792bece38e550…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 08:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36abce843f482d2aca957d862e925721 SHA-1: 0d4310c795d95814ed2292edd29cee4820f48ff3 SHA-256: 877792bece38e5504249f2155d08cf82ea040d68c583adaa7a64fa0f5ae305e3
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The malformed stream length heuristic also indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://churchtextile.com/userfiles/file/pururakediwekoborepaz.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086475f04567---zefiriguxobemorulixofar.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a0829b76a97d4e3e2fa9e6e13fefc5ca/pupolaveropadatu.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/juzowegoz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc0ca3c43---xotusof.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/jasitupobosovixefuzibibiv.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bn3l2tov91mst8a84gbilr5pf1/jevenefanuvosan.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kp14i89h64f059sdbpodd96k7b/88087446318.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/69384808702.pdfIn PDF document text
    • http://vititanon.com/user_img/files/nuzag.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba78e377e3---xurukogugedi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/1178602379.pdfIn PDF document text
    • https://naoshima-habitant.com/sazuwimifixodamejusometa.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/141267a1f0b76eeb8bb1f1e4c52c9fb2/79794694313.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pitopafugemegetuzisoxan.pdfIn PDF document text
    • http://ipublicity.cz/data/file/12212335843.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufisegabimaraxavixe.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3rt4u5od5gnfqds826csl06vq6/70557531222.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pipijulipabideragaf.pdfIn PDF document text
    • http://fitviewer.biz/files/file/buguwikodonumajabenafabo.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/lulivedax.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/radotasam.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/6732264335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mika+the+voicePDF 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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 23680 bytes
SHA-256: 28227631585b92b0bcf81d222a237fb11910b39010fcb08098a72bc9eab78af6
font_01_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 10060 bytes
SHA-256: 9d4f8ac8ef6c3414c5c3bf0c67e856cb22ddb9b181380ad28b4df3865926cff0
font_02_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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