Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbcaad00867de48…

MALICIOUS

PDF

89.9 KB Created: 2021-07-04 08:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 930eff1a99b7b31fa7d39cc6416a5b3e SHA-1: 1cedd61e920b9ec09635519c0ef2479959d1a887 SHA-256: 2cbcaad00867de48248e446f1a9e4f29b8a5fb4a75d6cd993e73ef2e6e4543ab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gapoom.com/upload/fckeditor/file/meloxinemosalud.pdf In PDF document text
    • https://rumahbaruku.com/contents//files/554248392.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n2nluu608bc1ok90j5jqsalrm3/50634691600.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2a8532f8c713a7b4bd7aa523f2dd9a36/1813240082.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/87109257341.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609719df943fc---14196990041.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511222035.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9d410c5284b13902215492fd573bd72b/ribux.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/febokarupoxotofanujojurij.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/c29f44a459b50ed195e1673471107623/23330607149.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/78503068011.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/32782774962.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d3ccfc72---witukivuloluxaxipes.pdfIn PDF document text
    • http://fitviewer.biz/files/file/28289303217.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4eae5c1f7---numuwasezimedonisuvul.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd2e9b2aa---45948359170.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cgartghpdtpb1ov7ad1cqh9q6v/rimetinodelogegita.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a443bf492a8---91268526603.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8e2bv0lcqkb0uct1dea4g26ot7/pipobafawe.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/25645774205.pdfIn PDF document text
    • http://balone.net/_upload/file///dusaferipamufujemezegane.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107040255475880.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/97693885499.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6a4dee89---73328444514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=banh+mi+with+patePDF 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_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 10224 bytes
SHA-256: 93a369d8916ba4399138bfa294360f41a6920f7eb93f9a80842003cbf5ff33d5
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 19164 bytes
SHA-256: 527071c93614e88ee4df0fc915d68a20c9cc41964501a5ff043b9d70ea6cc1ce

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