Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5c787864438b6a…

MALICIOUS

PDF

97.9 KB Created: 2021-06-30 00:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d816daaf4738d8f6f3423771fd1be1 SHA-1: 8f8ab6cce3e16f1107cc57a5db32db17698d3115 SHA-256: af5c787864438b6a7ab5d64e469b6c487378d3be9f7acadbc4b4a1954fdecf77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • 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://senhewood.com/d/files/nejizemob.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/56eab816ffe7499a519e372dd15f6acd/zivogobokatenufuloj.pdf
    • http://wsp.pl/userfiles/file/fewusenekituludutodexus.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mapl5aon6l1g7e7hklji2vakqf/luradebulojesizogeveroxo.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160791e2863754---zajolap.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9jir9adomb2aoeclqu1r4dppa4/97621482693.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gugijuxiduzu.pdf
    • http://teplolux72.ru/upload/file/saragulezijopodubowapi.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c075a0b1c1c---tomofofolokux.pdf
    • https://kidneystonetreatment.in/userfiles/files/xalisok.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/65001b2fbb201eab61c4127f5acee6e1/483991878.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3abb155a78---27779553694.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9872a382---mitaxidujepafe.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d50e18c8---vasawupeguwateju.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a8549661678---lumexedi.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c535937744f37f049f56000e3a74a49d/zezarikajuwovixefedivone.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ec4ec5f---27621945071.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45eb7aa75e---satali.pdf
    • https://campermagazine.tv/public/file/walotuz.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d75626a51---62930259464.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/pabaw.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/dbud9j6cmk0oamd1rpdfqqu2il/26090530063.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/japazukikek.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pliao5khplhijt0vrs330tsgv1/vadaritidojire.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=interview+questions+and+answers+for+internal+promotion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011917.bin
d34fdebba38657bc7c5134b4f47271a347ef6611965169b0da5430bc88934d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 11008 bytes
font_01_sfnt_off00013280.bin
b5080793d6f0eb8e529b8fae344f4bf644e6e6655aecfb3e8cbd34a706576cec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13280 17964 bytes
font_02_sfnt_off000161aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161AA 16792 bytes