Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90c134d5c957ad…

MALICIOUS

PDF

81.6 KB Created: 2021-08-16 21:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a674a5ac051a2595fabb44b992395e3 SHA-1: 291c9d7b2fe4e562edda2e68024e0b254ad1bcde SHA-256: ac90c134d5c957ad520382b3e0cf0729f44c35fb2798cdef6d4c9f9574592aed
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=murder+mystery+dinner+show+near+me PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4c650f37---vazoxebuzesexotabo.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/dolusib.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e24c60ed---76270051561.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ad72a539e68c2f8020d9850802919281/9664183779.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/bekenazoraxadinikovofibav.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a46ccbd867---89951294305.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1cef16be---41360546122.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/13009215777.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b849de7767---4211387799.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/patagejobuviji.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/9074461204.pdfIn PDF document text
    • https://nasikampung.info/contents/files/83205049526.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/kepoliketupoxubonel.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bowegunife.pdfIn PDF document text
    • http://446888.top/userfiles/file/relevazakanixen.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/nelusisalimuti.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091adb26ec00---pifute.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/repoxedopomogufuworixaleb.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/53811181941.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e87027aa---66799615258.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e66c653c---95635422554.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/zusagubajubebe.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/folusevuzominoboduz.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 17060 bytes
SHA-256: 29588d2c2a763900fc0f0fd2b629d6680e9b4e7c1eeb997740debfd99249c071
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10760 bytes
SHA-256: 22909194f98f2cdc18dbde5ea6f665751312e7f81432ed35d8b761da33f18de0
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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