Malicious PDF — malware analysis report

Static analysis result for SHA-256 363f53cd4f50cffd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 13:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 75f3db98aeae9d6fdebffbfd3d3bab32 SHA-1: 0798ba7a4686635616bad90b6faf03271995c35f SHA-256: 363f53cd4f50cffd83ef4e3a784484daf0fe38bc1f8fa41b5dd806376543c6fd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393a9d899b3---gerivosemesimilalud.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3282b4384d759b7ace0ff298d8d152c3/39112205870.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c37388b---51985054544.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/2204430068.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/dusugos.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/fabem.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/fomokigote.pdfIn PDF document text
    • https://tessuno.com/upload/files/6130ebe1e3ef4.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/ditizujilapo.pdfIn PDF document text
    • http://autodilygood.cz/files/file/jipojadawozerimexup.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407aea1ec9f---87201574089.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/66139466480.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/bezefutoribidigokig.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/27310647.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/47931280622.pdfIn PDF document text
    • http://reichspfarrer.sk/file/zosotejukeza.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/tizofigezisasazebas.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9eea6a6c2---lolazatimelix.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/kisugitifosigabonakoxite.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pezadudomom.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/pilet.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zazowarijeg.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/luvubitedevepolagidijimex.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/1858048163.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xaniwilosolalofenonojop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=parallel+space+no+ads+apkPDF 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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 18796 bytes
SHA-256: fc77a482d3fb91394ad6d3b0033613f990ee9c993b187873abddbf9867e09915
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10412 bytes
SHA-256: d395d9d41f8ebf03b1fc96437278fe844c2aed1a453858adccdfdebb5e86f3e8
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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