Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c135e659612af3…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 03:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e368be178d34d5446e83e18222f5f08 SHA-1: e689ae0a9472e399dbbdab3076db106cbd120136 SHA-256: 10c135e659612af39246654d8292f63cf80868558970a12a95a33bc01dbc84f0
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript points to T1059.007 (JavaScript) as a likely technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=buchungss%C3%A4tze+lernen+pdf PDF link annotation
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/digofesosur.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/48968772177.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/29966530728.pdfIn PDF document text
    • https://hojoairport.com/images/file/bewubugamenujidoniko.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/db0872ba733546f5e73a9e9c1cc7ee5b/xubosixu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c295c5a83---lomekazanupirawijogizol.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/roxefitabisaveresutepako.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/saxekutikixerugukuxelufix.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/65582898040.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/toxotibobudara.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t513co5m6se23v9s1c837b67b5/89143544056.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k4ugh2o0bn1ldlbhr8ev03ptpr/93700222445.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3e1d66c9519b0ae67661fa75d5d45288/49483652281.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160852de86de68---gixarodelovako.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/lepivimolelet.pdfIn PDF document text
    • https://elektrona.cz/files/file/60881539208.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c10fd5b98---jokeragajegetabuxulox.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/1b05b39fd779e9b35cda50179726e5d7/17952531717.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/laxawibife.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202cc822641---84871504851.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/3306695951.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/84202448786.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ecec6616---jiselozeselulexukivinun.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/gojetazedogif.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/wiluwidaroj.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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 20064 bytes
SHA-256: 4affb7b1f8083a45dc73882a2ba94ab3b9dd0d7ebdd7dfd0bd606d19cf59480f
font_01_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7A 10996 bytes
SHA-256: 3eb54db4e407ca46cca53167d60aa3cfa4f61c052a5536cf829cf2b76a90b9b7

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