Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea59390bbc6bd28…

MALICIOUS

PDF

91.0 KB Created: 2021-07-08 01:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f13f02ebc3c0bc5aeec4cfc34829b93 SHA-1: 33a21a7747aec45abe87bde9ab99e90e5f23b44a SHA-256: bea59390bbc6bd284937ee1bd66acdbc2ed31266841c4e77c9e166b00e53237d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://electrabicycles.pl/app/webroot/uploads/file/16213633232947.pdf In PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/59973412916.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/7029076959.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/komumotepitakivewobod.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/labanikixaduliretibe.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/73067238835.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/oxit.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/07tmqv6g8vtkb9h5l2s27ms784/dusamisoki.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/af4f1291ca9a39954090acd4cb81d22f/vogutosakibotimokiwades.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8e3d6ef27df804a0e93794bde441555d/fopafekunufupulumunotuko.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/50385384214.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/rekepogadon.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60f495f7c---56999672453.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/dunepipog.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/juruwak.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202105104951_24024105.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/32072939833.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vigar.pdfIn PDF document text
    • http://netflor.pl/upload/File/wamidepubi.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/bawijis.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/81jo4r3ldjuoq3du2h0ore246o/1658978897.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415839c0d8---82639352982.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686a7d12b---nidotozuxinapan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=homophone+of+ascentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 17308 bytes
SHA-256: a14777591b8408f7dc2b971d3303d29fc6f38ee5de7cc8b96b696d627b5ff65c
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 10500 bytes
SHA-256: 46669d8d6831152db2803e326a23a279a3b3549abd984ce0a653a8daf957ae71
font_03_sfnt_off000148a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A3 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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