Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d5df0c832818b9…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 21:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebc3afc9c5ce74f6075e269444a44372 SHA-1: ab103a2cf3a212a3bff56b75ab4d13a96762cd81 SHA-256: 62d5df0c832818b9914bee3c71ef0af7bc1bf3757eeebee36fc7ac8292194f38
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/564067f4b9939ca7e6ca5a0be161b90c/ledebugixi.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2030d7f665c0e87306b8f06a7aeaec82/favaxide.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dc1d4f22b062f7f89f31667cfdec6ba4/vituxaladoxomifijuli.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb5554141---65852025963.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/58010439185.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210624211659_mfm2u9.pdfIn PDF document text
    • http://ozari-ua.com/files/file/bazapadugojulutudejuw.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c369c8a9---49011244715.pdfIn PDF document text
    • http://fittbike.hu/files/file/63775044630.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/kusubisegufosola.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/35087891486.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/83654970181.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/lubeweriworapopadukipalol.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c97cd5a9---mumulakerozekuj.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jonizevajotawadix.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091126f01322---venul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074665b215a2---fomevotupemigabe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/japodojukatadepapezeme.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210619180344_kgep9l.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/iurhuku2k46smd5s9e3ceg1ag9/xafubagitukititu.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/19514371963.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4e38cbe3---tabus.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cdec9fea4---nutidiwim.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5512d522ce61b382e971593392718b28/14095929229.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pepomemujinakiboxubu.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/17328562980.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778bcd07c---81033093844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sum+of+roots+in+cubic+equationPDF 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_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 10912 bytes
SHA-256: 9b9608db3a78795c6e9958213b548f5608e323b9fce68ddf42dab1e030efa4c0
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 18468 bytes
SHA-256: 31e540b371d6bd383c25b1345fc83b5738f227e62c7c0d6d48262bf06a3a7349