Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98e4416d89aa27d…

MALICIOUS

PDF

84.2 KB Created: 2021-10-04 23:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bea4600e30beb2c472cc3f8b9c60af02 SHA-1: 6c88f4e0e94f016001ea433c686e8d9c3226e12c SHA-256: f98e4416d89aa27dff0d0c2a6d7dda4d9692924dfb50c1e43849a6ac0f59c11c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://travelworld.ro/userfiles/file/gawukefo.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/bokemeliruzakiwodum.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bf6d5dd2---pisubekisexisuzox.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/jasezipegajidupabuluxo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161440123e7b8d---siwaziraw.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/4900413500.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/3839101052.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/50520070290.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/70107466372.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/gibavinukikap.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/4442856677.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a2953163c4---95935541689.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/95603962321.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e43ac6c5a---93411201619.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xigegokoku.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/takexesawebizoj.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/94705929989.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/19930296975.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0u4gamgti01rsju3flojn092ne/rurisuwuf.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615438b275afc---pofesikenefemopebasodosiv.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935191b83b---51374674897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=form+8868+instructionsPDF 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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 18792 bytes
SHA-256: 32cd25d34ced9f59975c348484e9db412136fe4f47605e47c9dec513f1d1b809
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 10504 bytes
SHA-256: 97fe0795b9eed749ecd0b22b647680a7fd379e6db491f2bb832f07c3e42209ac