Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff46197fb486347…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 23:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b4a88920e357f24c01bb96e9c8bef0ac SHA-1: b52e19ca187d5c60be9a1c27a58733e5094a1eec SHA-256: bff46197fb486347d9b4f996fd207de6fc6812c244e90632a402767ebc48cab0
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, several of which point to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed to lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://aitrans.cn/UploadFile/file/F1202109120625165496.pdf In PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/rupegexiwofadomozomiminat.pdfIn PDF document text
    • https://phnews.ro/files/file/30440363113.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/rofalupubu.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/vubuxijujupijozof.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a134ec5db49a643bb759871cf8ba8b4/foxikamikewugodenorali.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/kekitugafazekorab.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/99997950193.pdfIn PDF document text
    • http://guowangcable.com/d/files/3522950271.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/90567364933.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/97143019086.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/65281666847.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/perarim.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xapuwedosad.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uacs5a336dpgop8ftalb1qgn6f/tuzitawemekujuvef.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/43487533077.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/naxofebulenijujejubejaja.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/mobuzofaf.pdfIn PDF document text
    • http://benly-carson.com/product/files/33886696884.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/5925560869.pdfIn PDF document text
    • http://sentralperdana.com/file/81279147628.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5de78d8bf---wifipimixokonenodekad.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b000bfd59---nuxavezugafuviro.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/mepukuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=english+file+pre+intermediate+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 19636 bytes
SHA-256: cd57d25580a90dd65f45f2180d356ff6cb164f0c00e9efa781315760224043c4
font_02_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 11100 bytes
SHA-256: 3a8bb25136562317aac05cd40c67869bb23a29b878d4948d9e17d7b111f6b130
font_03_sfnt_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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