Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c366ab2a7d6cbb1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 15:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8c52fd40e8a10700c51b7896cf16bc0 SHA-1: 10ac4e0e8db28a8fadc0211e801db34294dd6a80 SHA-256: 2c366ab2a7d6cbb171d55be810ee7ff08f8a9c3130e0a795ba7c2ce683418949
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=importar+contatos+icloud+para+android PDF link annotation
    • http://upoart.com/ckfinder/userfiles/files/kirajopefinefazafevunew.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/rarejerefuzoxokamofa.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/9269442185.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fiwilofakufanudefinupa.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nutapunavuzebavurabek.pdfIn PDF document text
    • https://bdata.vn/upload/files/2467411076.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/21360583850.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb7081a85---zemadejodedemufokivaz.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2157b4aaae65bac630e4f4555e0c86ce/68541317783.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82585714607.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/87437496685.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/18951916695.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/11822864130.pdfIn PDF document text
    • https://tcremich.lu/files/files/zejesetobo.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/95369479078.pdfIn PDF document text
    • https://afma.pt/site/upload/file/91598788416.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161359022b953e---pobuzibamavalo.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/jawisoxewevebudalugifatix.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/mijujimuzunewarofiduf.pdfIn PDF document text
    • http://getem.eu/files/file/batokigavogigojejij.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/fijabuterifewikerizaj.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/83931000438.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kizevaxu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cb1c0edca45c68edc73751d878880a0d/konawuvedugipokemofigeg.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/89593246260.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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 19440 bytes
SHA-256: d21e67fdcb3f88a12cede7a0744dc7f9684b11e82a35a1d98c05e6e5fe8efbf7
font_01_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 10596 bytes
SHA-256: 9bf9b34ae579eb91d6b79e354a1345fdd9ace6f0d4cf7f289910b723eebce826

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