Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f558ca62417e5fa…

MALICIOUS

PDF

95.5 KB Created: 2021-09-19 14:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 903f8f7346ea399b8aa184bc85ebae7a SHA-1: ec962c29c71097003eca6271278fe751a205b54f SHA-256: 3f558ca62417e5fa67655bfc1e44f100b5354af30dfe651d49459055f7e7f103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://philabc.ru/uplcv?utm_term=content+provider+with+room+database PDF link annotation
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/97351613387.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/23363707222.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/52423900093.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/73007437378.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/fazugotatexajiduvax.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/26862409927.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/82439651652.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135278d03f73---45881002526.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/bonekaminabitazoko.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/kibike.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bf4ba8de5f6248f2388a75d14453934/sewadin.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/3704947830.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433d1aba6e2---12454857184.pdfIn PDF document text
    • http://espwireless.net/uploads/file/59096782580.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/ranoguwuweroded.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/28501921126.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/47448129905.pdfIn PDF document text
    • https://fratellifurloni.it/file/liketumuromadovotoxinufox.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e162d92bbf---89019828360.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133358777457---zuwimuposoninokojaji.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/weloxizuni.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cmbtqsa50c4q157n5vmafbjm4s/7123580089.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/pusozevokolevu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 26552 bytes
SHA-256: 594e62c58183d0c0bb1fd5d5ea8159f0387140e2dc559d55a093f00ec7ab55dc
font_02_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off00013e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15666 10936 bytes
SHA-256: 08fd68f936b6fbbdc148daae4ba3ceb90ccd697d24fac24ce001aec49696652e

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