Malicious PDF — malware analysis report

Static analysis result for SHA-256 244b75361a4551c8…

MALICIOUS

PDF

98.4 KB Created: 2021-07-18 00:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af3169ebc2dd5941e17fd3bfd11b506c SHA-1: bc611b6c891a8975fc1b92703b4fba494a4284c7 SHA-256: 244b75361a4551c87aa03d5d2cc9d8017dd7c9b294898910fffaf954f3a04a0a
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 6

  • 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.
  • 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1011b88a27---sofeji.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125836ff3e---16787736462.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/jibavedizupukofedusom.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f67c611d5---sixitapewemiv.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071edc0492b5---sojuperopawiramovujuru.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a5b59fca0---85504761319.pdf
    • https://antae.be/app/webroot/uploads/file/70663072089.pdf
    • http://bygreenpure.com/userfiles/file/lasanusexeva.pdf
    • http://vivaibonomo.it/userfiles/files/furebedikeniboxuluta.pdf
    • https://menlopark.com/wysiwygfiles/file/peminitugoliwaz.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b02d3071e---nuxefokejedidek.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2907734249ba069ca87110e27aaec4cc/pudisupe.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0kiiap3jaaf3lu2gc0d5l5pi6f/fifisobekop.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5d65a052---novojemezewamidegilav.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85d4586d0---nipexopubatimovojogivaxiz.pdf
    • http://thedewakohchang.com/image/upload/File/etodoparajuwaboran.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2r8gml5q4g5ms6h7j3ic309gn3/53150466847.pdf
    • http://daimarconstrucciones.com/images/admin/file/74249865463.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75d5127aa---mirukivuronax.pdf
    • http://busangh.com/attfile/fckimg/file///2021070211549_781717979.pdf
    • https://info-jimukyoku.jp/lot/upload/files/zelozefig.pdf
    • http://maychamsocda.vn/images/userfiles/file/38968001867.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/topr3873a36ndlnkvalqestat7/gasanigona.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9951b30---44641329876.pdf
    • http://dsagco.com/Upload/file/90825740648.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58643912386.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=songs+to+text+prank+your+crush
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000116ca.bin
b348034a05c343f8b8a9b1ba953d32686585641024982dd1ca8b6f4c9bb9fd64		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116CA 18420 bytes
font_00_sfnt_off0000fd35.bin
a5d0597e9e92c134b4de7d5aeb4d100434cea98b05a0a50cbc5586efe581e43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 11000 bytes
font_02_sfnt_off00013428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13428 16792 bytes
font_03_sfnt_off00014c3a.bin
cdf361b98eb4dd5adde123f8c6d5be028a5a327defa44c94282f1012fb895c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3A 18680 bytes

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