Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca4b9238f390364…

MALICIOUS

PDF

93.7 KB Created: 2021-08-10 14:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84da8d52978c3dff6e2a7b5a7563dff5 SHA-1: d6611bec64207ce33a50dd8dd36020bd48a6dab2 SHA-256: 2ca4b9238f3903645a6c5174a1957377e32fdf958a51fb2692a4d45730c3e93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://royalrep.com/userfiles/files/sidesetofo.pdf In PDF document text
    • http://bluekeydigital.com/images/pic/file/78682136536.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/92a65a94b8351047598bb99f748d89b8/22515356209.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d450a994---lofigu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2e72ed803---kodulipivo.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/29542466438.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/122f394de4f238b3999505f65b7756c1/58888421454.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/31867024138.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2ohlolbrum7dj718g06qsnjet3/46581206813.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/78ba360eee850329f2e904f63c3e0da7/sifenogojasikutidife.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/3217899837.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5s7v3qp2vpvejbkt5tecmg38p1/bobiwabavatanekojiri.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e210451b302---metidu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19f22def0---28793756027.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/726nj68ik88cob80r9sj8tqfv6/fanukijex.pdfIn PDF document text
    • http://short-story.ru/upload/file/48042694169.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/vawekivob.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/63443bea242738c1526c64c258d3de62/bujononipokix.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf466d6e7e---generomoso.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/rft0omkjt1lae4hlkrj8tk8hfg/24464392954.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99193ddb8e---sigolojebubufanuzo.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/42858574752.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b953c2749---bidinazorikiziru.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856ef0eaf22---pikukudewuzifarefipuru.pdfIn PDF document text
    • https://saam.vn/images/content/file/42015013055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=first+angle+projection+top+viewPDF 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_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 18372 bytes
SHA-256: 3a545126d057f4c01f3c6158551ab7689d13ca8de5136afd3c0a3a7e50e89f18
font_01_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 10808 bytes
SHA-256: d6c7c5c5077540ec1e3ab1dbd6d583a8147d469378ceb173f190b4a324cc9cbe
font_02_sfnt_off00015077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1