Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb562cf24b155092…

MALICIOUS

PDF

80.2 KB Created: 2021-07-02 18:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa8cc83f1af042e3bf80a1897b3324ae SHA-1: 9610fdfe624354fdf6cbb38c6b34deed808c78bd SHA-256: bb562cf24b1550925644ad86444306052129062447689d464a1946e854ec9d63
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 websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c3791d6cf6cb4a04eb00447fb887b220/tubifukogifuzixifako.pdf In PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/fimabugeweja.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/11814111262.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bojufukajavipar.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/naxiviribapiladukaro.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73dcc1439f---xagobamaxiwowemunovugarug.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/69022180995.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/dodanetojituviwuru.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/mvfgi3v8io0gh8sq8o0nu1ifmm/53978061199.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mqj878pp22igvkcin7r3892fs2/wixavuvavupetu.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jovoxukozap.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210613221117.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f22a6dab---sofasakugodelapi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/sopopiwegiguzazomomej.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kerojiraxamitagosami.pdfIn PDF document text
    • https://123natura.com/stockages/files/85967655962.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/81239368098.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1r14t2aou14s42jtre56d2as1/28936119783.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/4f5b5339a6f0f23afbb86612b9c8a892/79403599134.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a163afdbf29---xomuzod.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d77fdcfdc---rowiroxuvudepelan.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f7904ccf---xeruritilu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/lupenigefijik.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/dolajumisunopeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=give+one+word+answer+for+the+followingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10824 bytes
SHA-256: bf67941b18d91120558a40538592c64d5d1a972025312e14695559e09c33f870
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16864 bytes
SHA-256: d14d3d380b782d85577913d04a961e070063c35e6ae8e324d975b439ffea0db7
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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