Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d993fd3aaeb5cfc…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 05:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b296a470b0b00021a0322b2b264bb2f SHA-1: 323e965756dcb5195bb75484e8bfedf9eed161bd SHA-256: 5d993fd3aaeb5cfc268ba71c8f289dc5aa42a5a6eba81669449ac94881c55069
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be directing users to potentially malicious content via these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fe2oc671jlst8ejtvf2pkgij34/67787363805.pdf In PDF document text
    • http://songhandiban.com/uploadfile/file/2021071001083773499.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/am7u4k05c4vb0ljhtp25kll120/kagezeloxig.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sfsjqit2fsetdse3rlv2vvg0tu/32870059451.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cab987b2b3ca24b8069a19285e79debd/kinusorijisi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f89d7667ec787f0e18670f9df940ae40/povir.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/2500975527.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7d0a9791fd663896a60028b1f35f4cb2/mozeforaponiminamu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/70564532901.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/j3kvrkq54ltjn1dj1cb7q2bq45/ruvuwaziriguvoteleten.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/8070537425.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd7809742---78384193592.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/vifigizafexoxitaji.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbad16c5c---81074144870.pdfIn PDF document text
    • http://toonesk.com/upload/nefebutaxirazugatodusasuj.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7a8a05d5fc2783c61cdba43362c6759b/dodazibo.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/gupiviwipexodurox.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/vaxisivuwew.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/sifuwojafupibipini.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/13050723452.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c7358ffb---35210803782.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/sefeturaxinona.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2543cd243a---70640128864.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/28183802065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=naked+young+schoolPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/25c7417793800ef829ace4c7075bbc7e/bonipifofoz.pdfIn PDF document text
    • 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_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 17460 bytes
SHA-256: a9a9553dc82ee53524014ddf04e96fb9be3d775a3e388c119cc3e66d06449e6f
font_01_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14231 10644 bytes
SHA-256: 1f72c33285ad56fd1e94a410e610d1e0a36471210598a59bafc0a7403d31fcba

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