Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58f5091ad0512f2…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 03:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 64eeb89b7d6616cd56326cc5f8ac6583 SHA-1: f09b89a6a2e83085312eed02b287116c8f51ccd9 SHA-256: e58f5091ad0512f2e29d7f0e2dd84f66e1de4649120c1edd669ae489a34c821f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to deliver malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614090f23da0a---bumevunemederajimolere.pdf In PDF document text
    • https://www.karelo.com/uploads/File/sigadinikaxekito.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632296296.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/39637176424.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/12728066367.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/jedemokabebodufisovo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1a082efc7---47105602593.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f079975316---mikavasom.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/37817430683.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/df0rm8in6smrpdruamag106efb/vaforokefagezo.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/3587636005.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/dobuwugenuwadal.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/28642607665.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/84471718879.pdfIn PDF document text
    • http://compsult.net/userfiles/file/72477317500.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/60392761465.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/78559922818.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/gonukaxapupuduru.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/gozexedijalutu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vuvipaduputuzujuxavitexe.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/46174257880.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/69345680424.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/rirese.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/76942743609.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109210406581424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+manual+setting+for+outdoor+portraitsPDF 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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 14760 bytes
SHA-256: 5959ede581036795420901149f46a2d5dfde6386754ee8e300cf221b59e7539c
font_01_sfnt_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 10996 bytes
SHA-256: 153f9626881e19649c7f8cc00874b1c976c6462a98c0b4bc9289364137b507a7
font_02_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1