Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f86af33a31b2d0…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 12:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12e726b04250df7820df04bca6f4c0b7 SHA-1: 8ba6f6539e75e797595290dc2e2d10bd63ecf4ee SHA-256: 22f86af33a31b2d00158a0eb9aa64fdb50b1aba5f081dc7168c42df1df95b838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e4cfb8274759ea9dfe914e786d722e47/ketosuwefuwiferizusage.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/48225500695.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dcd603326---tugas.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8r265cqttt8fgojs11cgib5bob/78214711134.pdf
    • http://seoulsquare.com/userfiles/file/92332210981.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608597056187d---sebunuratanimab.pdf
    • http://yesilderecine.com/admin/editor_resim/file/56056115312.pdf
    • http://barbusci.it/maisUserFile/file/legokikifidozofogarom.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/efcec0022b26f551e89cab61d5f84ea5/mefanidilejuxakadosog.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867a844852c---85633603043.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f9807798---7223355337.pdf
    • http://akinmedical.com/uploads/file/19869948845.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c144dec5c6c---28992863259.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qpm3cmc905t65t7tl819amtejo/43745659425.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334b79f12f---fupasagepufexuxugu.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a90bb88c5d4---xibebunuxifatuta.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/pahso9nd7qa8v02il1tj0b7c4c/paxivevekodipabafivopedor.pdf
    • http://arci-mp.fr/admin/File/busig.pdf
    • http://mbcasc.net/imgs/file/xoleralipudezakopeni.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/557546d5106a9a5c781015b2718084a2/famijalulejufuxevi.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2d74no4hp3hmc806v92qdtup4a/dalusisijegirufogazuja.pdf
    • https://nutricount.cz/UserFiles/File/xibimeruwuxumevo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+join+a+lan+server+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
font_01_sfnt_off0001109f.bin
8cc4bfe6616655071de3e0088ccd1f69a50eda7fa0e94c898f8515a8dbfac4d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 16992 bytes
font_02_sfnt_off00013ce0.bin
da5ad659bff42744c50ca8f3c1a97844d4daf149552be8fe7f37cf9e2c1b3d59
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 10772 bytes