Malicious PDF — malware analysis report

Static analysis result for SHA-256 474cfa4f7b58da4f…

MALICIOUS

PDF

93.6 KB Created: 2021-09-06 02:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f766219e8a4335de6e5aa15d73f17173 SHA-1: 580d244f848712119e66cd3d4cf9c2d99838f4d8 SHA-256: 474cfa4f7b58da4fddb1c0abc1bb6b3689128c1d6320300acce8b7bf15cc107d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ko91kj22lik588n21rj5sq1061/popuzowedekasafigajef.pdf In PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/jegatifezexedonefupula.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/gezito.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/fopomogijasiduri.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a3a2ccb8---tisugurosigewijoguxe.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/47477909024.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/02828afcab45e7d1b54c945d9c80fa2a/zazuvuwulal.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a152d5eddd6---78039017163.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gejes.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14964e2d1---15553067480.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/dabase.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e4d4cb8b04392bb996f9f795fd1950d1/21671884075.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eec0357a7---81397817099.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2d9da218defeda1191b249ed7875b839/83802137887.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sonk7l5rfuio54qlvh7d4cni93/46907127105.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/nilomegiloxovasime.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210623_5CC13604CD1D8FDC.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_215810_103.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/magupujizobovexusowonip.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48b7d83ab---fasijuxe.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/83394248157.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3v89tcgf7po0i7hpi6vasfef81/dudavusuruzesujovu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/poworedofobomumubewefi.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/25704954815.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c0567c0---1172648054.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/71613284051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=%C4%91%E1%BB%8Dc+file+pdf+b%E1%BB%8B+l%E1%BB%97i+fontPDF 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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10912 bytes
SHA-256: 69dc904357b44e44cd487d6505f0754d3cf30322ba88477520408c799322026b
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 24800 bytes
SHA-256: 99ccb3f858ed84425cc490dfcbd20325c25e43c11a301cf654078fe74e2714cb
font_03_sfnt_off00014e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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