Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c776233914eb1c…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 02:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 70220f0423c4d06a1a86f74b53cf9850 SHA-1: 96ff714c95fc7e5d555c685289bc628c8b2d3c2e SHA-256: 43c776233914eb1c5413218d1b7e67b181a7e1532d27da1dc1540a0e23d35b81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs and link farms supports this assessment. The document's purpose appears to be to lure users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=in+cold+blood+audiobook+part+1 PDF link annotation
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a383cacf2b1079f9b993fd50e6e29dfd/migovijim.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd802afda---kerefos.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/62749942206.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b80bf372270---89229259246.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a4a9c0b3---romuxolisusux.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f9a51dc758293be6ffd902132c84c63d/zidusa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd6841a1f3b7e29f3d13f24329d9fcb0/11318318104.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43afa35bfc---37060969062.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629bdc1513---97721009841.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856e67a8cc5---jetisalitazarisopoxoz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6fd1e9c14---61522059107.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/47c8e0635d66d764d7086fca885b605e/50310423336.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/65b2204f8fa1ee49f678449d9c701b08/zutadakuxeb.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8b1cf5516ccce1bbd46bd147724713e2/sudalasibefakojifavole.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb8be2e07---rogowevixanimusufas.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/80120598151.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbf2aed99---4569603679.pdfIn PDF document text
    • http://ipllaser.in/uploads/luzerexulodusojunakaku.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gcnck8g3j521m10qr9abqq24jm/77226918813.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hf2kv08gblt6mnrrv55i0jnueo/61724506244.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/pidawixasizofeb.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc62a15082---5586787136.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/namin.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/64f652ee93956005a94afb78e1a3a829/fipanuvix.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_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 10540 bytes
SHA-256: 6489cf16cc56459b4c60313807cbd1f11d8e05dab2b832f8f6114943246ac50e
font_01_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 17020 bytes
SHA-256: f3d12272be97c858a632f492bcc0f4e6be6f9e38f894327a9877258df53f7fd1
font_02_sfnt_off00014766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1