Malicious PDF — malware analysis report

Static analysis result for SHA-256 d784d7e4daf19db6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc96d7d03d6d83332d6902f14ce0c21c SHA-1: 59c9588f2ce8453fff598784f856bf8ec22400dd SHA-256: d784d7e4daf19db6a3a06400860f6635fac1ccfbb46ed34f36ba979ed0d8ec69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6e600f60---jirojimulogag.pdf In PDF document text
    • http://pm-ural.com/uploads/files/50429159399.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/92185788471.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8d06c5098dd084e9f8075427cf997001/luzomu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b50fcde89dc79e11bcbb22717e74648d/66956517994.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/saverafobewusiru.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nutakuwo.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/52832226504.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/8797551154.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a7ba3504947420a793e4d561e92a6bf6/6513335020.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb6bb4186---bugowokigenitinavina.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/rugixaneviwa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16125ed5c4c695---26427380009.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/sisefox.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/dc70465de45791fb0a514d8f87f362bf/1655398567.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e244e93bf02c32584daee6b86284409e/38451533670.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/39151027262.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/t08m020rpm383l3cihfims9t13/13362200511.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/88465364401.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/023ddb60c745c035e13b29318dd21b22/posimonodeziwapini.pdfIn PDF document text
    • http://kelvista.lt/images/files/talipanovasitejadizofolol.pdfIn PDF document text
    • http://edgecs.net/documents/85392024218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=analytical+chemistry+course+pdfPDF 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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 18604 bytes
SHA-256: 91799321be8e265238c4a438b5f7ad77a7c4bb55771290fcd2cc2043b7c17d27
font_01_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 11080 bytes
SHA-256: 300fda20d9b8d2d59dcd41f46c9f9a9c15ecf79a75279fc7d15af468eba782be
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1