Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4eea5f2d89054…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 07:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e035f8aa463a64ff8c05c573f4ddea29 SHA-1: 445f5d1dc88b24087e2e55d5b180a5fdc992924f SHA-256: c1b4eea5f2d89054692646d8a28cfeca45e5a3a7bf2cf1b712820775c53896aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://appvid.eus/userfiles/files/3114058200.pdf In PDF document text
    • http://willbramephotography.com/xeropemedipuga.pdfIn PDF document text
    • http://nfc.soo.jp/file/55377547021.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/xuwoxebukukodovuka.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/19564665744.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/wizamebigikovunomorilap.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8011daf375a7fa65bd2eccb3a44a874e/nofusukikazikijul.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/41n1u39npjfs4ddrqo0i2fij33/limib.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0910e39d---gunuwatimojog.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/legigevuwepibigukak.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b287661224e---41265755340.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608afc8b0b507---vixasatatujenatafimod.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/b6scga8ojqn5v2d3gn3vojrkd1/81893436242.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc25180fa3---nutiwomijafokozo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kjmglqki26p97eedriuafs14dt/fakuwomibitoporamokinali.pdfIn PDF document text
    • https://dm288.com/slicice/file/84707622080.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3a9e1d510---semaxulole.pdfIn PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/71034016059.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2da338e9cfecffff385d2add4be8bd9e/77219157967.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/38985839145.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/85056851587.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/39568833666.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/39093115502.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b864ac9b1128de93ce3c14b9e9d3def5/91733359743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cvc+words+worksheets+for+grade+3PDF 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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 10960 bytes
SHA-256: af942df095d604a88d4cd070adf69c980b1a6e5c05ab08261cc1b09bb4004252
font_02_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 17980 bytes
SHA-256: 43c8729f2cf82c0058012776d148e60b0c4409464243da0cf75731f4dff0f5bd

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