Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf6d9884d493158…

MALICIOUS

PDF

91.3 KB Created: 2021-08-08 01:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0324b80489ae75323d77fa1c03071a1 SHA-1: 00cbed5ece72cdd5691b41700ab35db5708c3006 SHA-256: 9cf6d9884d493158e1fc33d2e84f93dd57d1ffd0feb517083083992f45cbaa4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of the next stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb9ad82d7---58845706646.pdf In PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/lurapirujedoges.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/komiratenufep.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ruwagarilijaxefuvubajesa.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160920010660f2---43109831628.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/pemenurilokotujaxa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8b569586f3454c48bdf2228aab85fe07/sesetidemibesupofa.pdfIn PDF document text
    • https://premium-house.uz/images/file/77097807575.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/74330448237.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8308a61f4---panuzonixowezurigodamo.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/46ecde2d1ef87bae0eac02c3ae69ce13/83284008175.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/93179588662.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/65215151993.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/sizobu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce74abaa36---kagizazatubibogedorut.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d901275dd3---lilesawa.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/24605924442.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/df7a322bcb2c20b725c8948cf11dfddb/kotovivojuvowopovuwij.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xifekiselopik.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/56471654216.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef7d9f340f---momobovodaduterobemin.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/65010392219.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/danuvikasulizepafabixur.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/86559002540.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/baxalu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/45a2cf6feb72649852e0e848eef6fdd9/95234979179.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/movefomewakanonuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=oraciones+pasivas+perifrasticas+y+reflejas+ejerciciosPDF 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_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 18732 bytes
SHA-256: f50e2aa69417b8b1274349fd04fd0013cb1fbe5b54622e75f29b6988a4826add
font_01_sfnt_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 10808 bytes
SHA-256: 16344c5dca2ccafad8fd818fe8ba4c9f3754e477b7f14eb76782c51bdb2480e1
font_02_sfnt_off00014447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1