Malicious PDF — malware analysis report

Static analysis result for SHA-256 033ea4c4f995951d…

MALICIOUS

PDF

88.9 KB Created: 2021-07-21 11:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e124d62253edf54c6b41641b7a1db694 SHA-1: 094c8585bd3a1d82b9dd5c2ab01847c7bbedf5c8 SHA-256: 033ea4c4f995951dce84fc28e00aaacdc49c138ceec27fbeb1e16df5710b138c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://study-abroad-travel.com/ckfinder/userfiles/file/4891701398.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/kahpt3igqrg3gs9ibaq0rrkdrn/94666482376.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/82775497988.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/zepuzabetiponukali.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/950fbd9bd7cd27f1ea75f0cc49676453/82833475752.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/tewazoveloxufumitowaro.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/46349394958.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e09c6e19bd0---65452025836.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd5f7ce4e---wosovabovegerolonebipi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/13499978305.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/murap.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xufirali.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/o97oscsb5ar2usvgobaon66r52/penurawug.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7t4a1flp8vrf2831toph12ct2u/55264830606.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/89050055631.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/46187230343.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089595c51189---talugitiboxetukavuneges.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/649704047c2c566decdd3fd75161363f/70159248178.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/livig.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3a497751c1d3f199b5dfe4efe4f64a41/252065707.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/5045655237.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e602969d---58778132064.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/bd62acc3465b34ca4db918e983c9a4f2/senalelafewopugojegop.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xadowitofefimiraxuwuges.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf1bdd249---49760673009.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/crpu8go6eri4mum0pi59445v2u/51486371693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=essay+writing+sentence+startersPDF 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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10424 bytes
SHA-256: 30c6336f55b80e035f1aa2f531debe5609f6a09aa01fcea200174850fe7e7dd6
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16640 bytes
SHA-256: fe476764f3f9d60437a5923b1d89bda9bdc765db59af211f4634cc5600cc8052

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