Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ba8af5292bc2c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-04 21:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4040522200e270159e8404ec701f5f3 SHA-1: 12f712e33ef6d9a9844b8e0fa463502481c816e4 SHA-256: a47ba8af5292bc2cd18b49f0ae9d798cbad3596f8472fd7c2bdca87eb9f88238
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it is designed to lure users to malicious content. The presence of multiple external URIs and link farms indicates a strategy to distribute or host malicious content across various domains.

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 https://crysiq.ru/uplcv?utm_term=terapia+intensiva+cardiologica+antonicelli+pdf PDF link annotation
    • https://efficientinfocomm.com/ckfinder/userfiles/files/valizobisilazidibedelebad.pdfIn PDF document text
    • https://nomortiga.com/contents//files/xefafixajekadomapaxotet.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071986ca348f---4844991430.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/zoredat.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kle9r5ueg6vr713c7ab2u6b6nn/nugokepitijofenod.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/koxoru.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/51730085661.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e27928f12---4998516632.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ee7ohm9t1j9dj2gmthl66j6484/nemetabedal.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2895745136c6fc75394317b2c11dd674/15716786959.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d7c014b9b39cb5326d89272ef52c4eb6/49785279216.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a37434e83---86859249118.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kizus.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/93rv65ubm81gqkafv61919ngp1/29487786918.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xunujepagonurof.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/42587109337.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/57377759220.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ff905ffc---38327798870.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a0afe1f553cb7adc85b086b598a90be1/46695652633.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mgd5i22gl8c24egfum484cs6cg/jarakidawanulizudaf.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/17603338072.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vrkr7dpn29a90sorme8s0q9vr6/55597913574.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zakolelasagureme.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ace50de13---71955785207.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10824 bytes
SHA-256: 97caaed7bb0459ae95a3aa47aa98da027beae42045a1cfbdd27e988eaa558b4b
font_01_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 18500 bytes
SHA-256: d705a81688672bb25b3e0e92b40414074e9dda80e7c1350f5f0757023c42ddbf
font_02_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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